He really only needed 1 shield over air/beach spawn and the expansion for beach and he would have saved 12 extra mexes from the novaxes.
Honestly turin could have just invested the 80kish mass he spent on 2 novaxes into an air win and killed all the mexes with strats like 6 minutes faster.
But yeah, this is basically the best possible case for novax. It's an extremely intensive map which makes preparing for novax to be painful compared to simply sending it to attack outlying mexes. I don't see why it being strong here is some mark of it being OP. Zthuees are strong on dark heart as well, but that doesn't mark them as OP.