I see a number of posts here proposing/requesting that moderators "explain" or "notify" deletions. It's not practical. As a moderator elsewhere, I'll delete a few non compliant posts most days (and probably miss more). I am already doing moderation for free, so I'm not interested in preparing a five minute email justifying my reasons per deleted post - too much time! Even if I would spend the time, I certainly do not want a resulting back and forth argument about my decision. So that forum has a very certain "do not justify moderation" policy. Do what you need to do, and move on. The poster may consider their deleted post in retrospect, and will probably figure out what they should not have said.
Think of this (or any forum you choose) as a club you chose to join. You chose it because you believe it offers an environment which makes you feel welcomed. A part of that is that it is tidy. Hired staff keep the place neat. You like neat, so you pay dues for it, and the hired staff who "moderate" the mess are paid. Well, on the two pilot forums I moderate, I'm not paid, and I bring 45 years piloting experience to my moderating, so it's kinda high priced help - for no price. Moderators are typically quite experienced in the role, so, asking them to do more, may be asking too much.
Hotel lobby rules: Don't post anything you don't feel should be said out loud in a crowded hotel lobby, where anyone could overhear.....