I think it's okay to delete some posts that you deem to be of low quality or bad quality - you and anyone can delete them as long as your post is still deletable and doesn't violate anything. But what's the point of deleting if any of us can easily find the post history via the magic tools ninjastic.space and loyce.club?

If the deleted post was their way of destroying evidence - then surely some of us have the right to suspect it. But so far I haven't thought about much - ignore it as long as it's not something too important to take up much of your attention.