Cohen says he pleaded guilty to some things he did not do in order to stop the Feds from pursuing his wife.
(He did admit to the campaign finance violations on behalf of Trump.)
Tom Arnold is a twitchy, half-witted little creep whose brain has probably been permanently damaged by years of drug abuse, but every once in a while he produces something interesting. For example? Howard Stern would not turn over all the years of Trump interviews, so Arnold went over to the dark side, obtained them through the back door, and got them published. Sirius XM filed a copyright claim to get the audio removed, but all the transcripts are still online, and of course there is still all the audio evidence available to support the transcripts, should anyone dispute them.
And, well, if you know how to use that whole zany interweb thing, you can probably figure out someplace where all the tapes are still available.