The post was there before but he deleted it too, thus those not knowing about ninjastic.space will never see this statement where he admitted clearly that he plagiarizes 90% of what he wrote. Most likely, he deleted other incriminatory posts as well.
The way I understood that ( now deleted) post is that he claims that only 10% of the
overall bitcointalk content is original and rest is copy/paste of someone else's material and not him admitting that only 10% of
his posts are original, in a way to justify his extensive copypasting as according to him, everyone is doing it.