He did not send a warning about bribes and corruption.
He said he has files on people who incurred in those, and he keeps the files to be used as a blackmail tool to make them do whatever he dictates, for his political convenience. In this case, a a typical Latin American socialist populist dictator measure, namely price controls on foodstuffs. So crime is OK and is not prosecuted, unless it is politically convenient for the Leader.
His opinion is what constitutes "price gouging". There are laws against that. And if there aren't any and he feels price gouging is a problem that he needs to solve, then he should legislate for it. Stating clearly the criteria. If you watch his video, he basically is saying that he is the one who determines what is "reasonable" in terms of price increases and profits. So, yes, his opinion, purely. Again, typical dictator behavior.