I'm not reading it that way, I don't know where you are getting "AI will eventually replace..." from, if anything he seems to have the opposite idea: "even if AI can do the type of mathematics we do now, it means that we will just move to a to a higher type of mathematics".
The line I quoted is in response to "in two to three years mathematics will be “solved” in the same sense that chess is solved".
Unless my priors are dramatically wrong, anyone who believes that is indeed full of shit.
In the article he does afterall second the notion that AI will eventually replace a lot of human labour related to mathematics.