unless he can prove he owns that Twitter account or got permission to copy their messages (and the recent posts might have been deleted)...
He doesn't own any of the accounts he copied and pasted the texts from since he doesn't do that from only one but from a lot of them. He mostly have posted the tweet link along with them. See below:
Although these are the most recent ones, and he must have probably been banned for what he might have done in the past.