ItsAMemeMario said:
First of all, thanks for undeleting it whatever the reason. I admit I'm not too good at navigating through this site beyond searching posts with tags, and there was no way I could have found out about the internal discussions that have happened (about this, please if there is a centralized announcement place point me to it).

Sorry for jumping to conclusions and getting somewhat aggresive. I understand and am in support of deleting those comments having been explained the reason.
Apologies for the harsh tone as well, it's just a bit of a recurring issue you got caught in the middle of. The rules are in the wiki, with more granular technical explanations in the dedicated pages you can access through the main one https://sakugabooru.com/wiki/show?title=help%3Ahome. Since it can be a lot to take in, and there are some details that are hard to come across, I think plainly asking is just better. There's a ridiculous amount of content to moderate so I'm aware that we all sometimes leave lacking reasons in the deletion field (especially if it's a veteran user like this, whom you can just say "nope" to and they'll get why) but with enough context, I think this case was fairly clear. Saying that the element of focus (at least booru-wise) wasn't particularly remarkable doesn't mean it's even bad or that the scene as a whole has an issue, just that the people who made the decision thought it wasn't worth archiving for a series that is already quite well represented. I'm one of the owners of the site and have nearly 200 deleted uploads, and they're not all simple replacements - sometimes others just agree that it was a stretch and that should be fine.

How should I do that? Afaik you can't dm users and there is no "contact moderator" function. Tbh, I don't even know who the mods are. I'll reach out properly next time
There's a flagging button that effectively does that "contact moderator" function, though it's aimed at unapproved uploads you want to bring attention to for some reason (like them being a duplicate, issues playing in certain devices, etc). I think messaging in general is more effective, especially if you want to argue in favor of a deleted upload and thus need to get in your view of the sequence. You can DM people on the site by going to their profile and clicking "Send message" at the bottom. It's not exactly the most graceful messaging system, but it's how a lot of this stuff is handled to avoid clogging up the site too much. You can message me or any mod (these are the current mods https://i.imgur.com/ZnUtaTA.png / https://i.imgur.com/OyCMqtY.png), though many users have simply reached out to whichever visible face of the community they've come across - even if they're not a mod themselves, they'll probably know who to poke. I'd say most of them do it through Twitter and Discord though, just because they're more suited for this.

About the post itself, I think there are more than just smoke effects that make it sakuga-worthy. The multi-layer fire particles (which as far as I can tell are hand-drawn) add depth to the scene. Some CG elements are cleverly switched to hand-drawn animation when close to the camera (e.g. Armin's broken face and Eren's forearm at the end before he swings it down), not to mention lots of the CG is already completely drawn over with smears added.
That last argument is the one that makes it click the most for me, since the timing of the 2DFX matches that of the bodies too. It simply clicks together to emphasize the scale, and imo that is good enough here.