It starts out with saying how much of a threat they are when we don’t even know what they are yet

This was said by the author but I personally found it to have been obvious even in draft form; this page follow's the SCP format of starting with the "special containment procedures" before the description to act as a hook and to make readers curious about the rest of the page.

and then you describe them a bit and show all the harm they’ve caused, and then at the end you just attribute it to humanity’s desire for war and destruction and remove the value of all the harm they’ve caused by calling them meaningless

Because it is meaningless. I don't know how you interpreted this page but to me, it's pretty clear that these entities are manifestations of human conflict. It is meaningless because all of this destruction is happening with no rhyme or reason. These entities exist solely to fuel tension between the MEG and the UEC. The endless conflict is happening for no good reason and people are only dying because that's what parties at war do.

There’s no real story progression here

This I agree with this to an extent but I don't think this page is trying to tell a traditional narrative. As I see it, it is showcasing the tensions between these two groups, how they attempt to work together to mitigate a conflict that they have started, and then failing (last appearance record), because not only are they fundamentally unable to put their differences aside, but the only reason these entity attacks are happening is because of the conflict between these groups that they too obviously reflect.

the concept isn’t even redeemable because these are just less interesting versions of The Black Knights.

I'm sorry but, what? This concept is irredeemable because it shares vague similarities to another work (that the author has not even read)? Are all city levels now irredeemable because they are less interesting versions of Level 11? I haven't read BK past the first few tales and your explanations of them but as far as I can tell, the only similarity Entity 234 shares with them is that they're both militaristic and anomalous/mysterious. The Black Knights are assassins from the Frontrooms in a canon where the Backrooms is a part of the subconscious human headspace. Entity 234 are physical manifestations of the vicious cycle of conflict between the MEG and the UEC. How are these two things even remotely similar enough for the latter to be irredeemable?

However, this addendum is a bit confusing because it's not clear if it's the first recorded instance of meeting the entity or the first recorded instance of the MEG and UEC working together:

Number: Entity 234-A
Date of appearance: June 8th, 2021
Location: Level 218
Impact: At 1:15 pm on June 8th, an Entity 234-A instance appeared at the site of M.E.G. Base "Fortitude" in Level 218. The U.E.C. personnel responsible for patrolling Level 218 on that day believed that this was the M.E.G.'s assistance to their remaining forces within that level, so they requested a combat team from headquarters to eliminate it. Due to a lack of understanding of the entity's special abilities, this combat team paid a huge price. In the end, ten armed personnel belonging to the U.E.C. were killed. Due to the deceptive appearance of the entity, and the pre-existing conflict between M.E.G. and U.E.C. within the level, the U.E.C. used this as a pretext to provoke a local war against the M.E.G.

I think the issue is this line and specifically the bolded word: " The U.E.C. personnel responsible for patrolling Level 218 on that day believed that this was the M.E.G.'s assistance to their remaining forces within that level."

I think it's supposed to be the first recorded instance of the entity, but that word "assistance" really throws me off. So, some clarification would be good.

Overall, the article is very good.

In summary, the above are some of my opinions. I fully respect your opinion and appreciate your explanation of the reason for the downvote.

I often love your writing and I had high hopes for this, but it’s going to be a downvote from me.