The Iranian role in that conflict is neither secondary nor off-topic though, it constitutes a central aspect of it. Iranian instructors are said to be actively supervising if not directing part of the Palestinian Resistance's ongoing operations (as per the PIJ official whose statements were posted there), therefore it would amount to an arbitrary decision to prohibit users from sharing related reports.
Furthermore, by that logic, one might as well erase a considerable percentage of posts in that thread due to them having to be considered secondary and off-topic too. I would guess some 40% of contributions do not narrowly deal with battlefield updates. Clearly, there would be an element of political partiality underlying any notion of censorship against the posting of legitimate reports about Iran's direct or indirect participation in that conflict.