I don’t think so. Not even wrong is for something where you can understand what they’re saying, but what they’re saying is so nonsensical that it’s not even wrong. Peterson instead uses words that seem like they could belong together but that are borrowed from many different fields to end up with something that sounds like it could plausibly mean something if you could unpack the words he’s using, for example, in a debate he said this: “We lose the metaphorical substrate of our ethos.”

That’s not “not even wrong”, it’s just words that have never been used in that order by anyone else, so they could essentially mean anything. Unless you can get him to explain what he means by those words, you can’t say that he’s wrong. But, he’s using those words to deliberately obfuscate what he’s saying, and if you ask him to explain what it means, he’ll just drive the conversation somewhere else.