It’s because it wasn’t related to the main topic of the post which is the UGC. You need to keep off-topic conversations off the thread especially if it’s a public announcement.
The system account only sends a message if your post was hidden. The system does not flag posts, the community does. I believe it’s something around 4 users flagging a post before it is hidden. (Don’t take my word on that) If you don’t see the post, it was likely deleted after the flags were approved by a staff member, who then took the delete action.
“Hi there, I love this”, isn’t constructive feedback, because it doesn’t provide any meaningful insight into whatever the post was about. It’s against the rules to post feedback that doesn’t provide any additional insight to the original post. That’s what the like button is for.
When something is flagged and hidden, it can be diminishing, and you might feel as if it was flagged for no reason, but usually when something is hidden, the amount of people needed to make it hidden means a lot more than just one person disagrees with your post.
In general, it’s best not to comment on flagged status of posts, since the comments will be obsolete once we go through and deal with the flagged posts.
We will typically remove any comments about flagged post status because of this reason, and this is probably also why the community flagged those posts. The comments are not relevant to users that come in and read the topic after the flags have been handled.
If you have any questions on specific moderation actions in the future, please reach out to @DevEngagementTeam in a private message. Hope that answers your question!