I mean, he’s actively supporting the opposition (Trump) right now. Were Trump to win then he’d certainly be in a very good position within Trump’s desired oligarchy. Until then he’s just a very rich asshole whose main major concrete political power comes from his ownership of Twitter and (largely artificial) audience. If anything his support of Trump kneecaps him in his ability to run his businesses as the Biden and hypothetical Harris administrations are not as likely to let him keep getting away with all the blatantly illegal shit he keeps doing.
Michael Bloomberg OTOH fits the term pretty well, as he’s a very major donor to the DNC and that certainly makes him very close to the ear of the president and policy decisions.