I'm not sure how it's plausible that we would (1) want to host something like what you're describing, and then (2) completely scrub it and pretend it never happened.
We don't ever delete anything from HN (except in rare cases where a user asks us to do so for privacy reasons). If we had deleted something as controversial/inflammatory as what you're claiming, it would easily be exposed; the HN API is public and many people ingest and store everything that is posted, so someone would have a record of it and could easily dig it up. That's aside from any cached copies in The Internet Archive, any screenshots of it, any tweets about it, etc. We never even consider trying to hide anything that's happened on HN, because it would so easily be exposed if we did. If something bad happens on HN, we own it and work to improve.
Edit:
The thread you must be referring to is this, in January 2024:
ICJ orders Israel to prevent genocide in Gaza, stops short of ordering ceasefire - https://news.ycombinator.com/item?id=39143043 - Jan 2024 (1401 comments)
This comment, which appears near the bottom of the thread, is from someone identifying as an IDF soldier and sharing their perspective: https://news.ycombinator.com/item?id=39147721. That user posted 9 comments in a thread with 1401 comments. Most of the replies to them were hostile but attracted no moderator action. Some of your replies attracted user flags and comments from dang due to breaking the guidelines. This is routine moderation. The guidelines apply, regardless of the topic; otherwise there would be no point having guidelines, and we'd never be able to have discussions about any difficult topics at all.
The main topic and the overwhelming majority of comments in the thread were critical of the IDF.