No. He was convicted of falsifying business records, which in and of itself is a misdemeanor. It became a felony when it could be reasonably deduced that he was falsifying records in order to avoid reporting his hush money payments as a campaign expenditure, which was required under law.
Personally, I think it's an example of someone being convicted of a legal catch-all, like a drug dealer being convicted of not paying taxes on what he gets on the street or Al Capone getting convicted for not paying taxes on his boozie bootlegging.
There's a reason laws like that exist, however. If we allowed business executives to falsify records, we'd have some pretty serious transparency problems. If you want to argue that this was a pretty piss poor usage of the law, I can at least entertain that idea, though it doesn't change the legal validity of his convictions.