I don’t see that as very accurate. He actually has done and discussed doing VO2Max work specifically, in at least one post on the forum.
He has discussed his own Sprint Training Block on the podcast on several occasions. He and Nate also hinted at other possible versions of “camps” and “blocks” that they wanted to offer, so people could work more specifically on one system or another. These have not been introduced, but the discussion at the time lead me to think they see value for some people and case to apply these block.
This type of work can be worthwhile precisely because it focuses on one area of interest. As with just about any training, there are also peripheral gains in areas other than the one of focus and interest. Training is not black and white or as finitely specific as we might think. We can improve on some areas while also maintaining (or even building) other areas.