this is strange, most of the posts he deleted are from 2020, maybe it was a case in which he didn't see hope anymore
I agree with you partially that Op has deleted his/her post/posts as there was no chance to get any positive effect on that case. And I think OP creates post/posts to blackmail of that site. OP may think if I create scam accusation against them then I may get few money from them as they might be afraid about their reputation.
Op created 4 accounts which is unnecessary. If they can block one account then why they will not others??