Can I ask you to detail out why you think that?
Most of the participants in the seminar were from Tai Chi background. Early on Dan said that he isn't interested in Aikido that much and his focus is now on MMA. Except for this and a negative remarks about hanmi, he was much less diplomatic there than on this thread, Aikido wasn't mentioned. Some of the things shown contradicted my knowledge (Iwama lineage), some of it was orthogonal to it.
Ultimately, looking at the videos of the the Founder, Saito or Shioda, I don't see them do anything similar to what Dan was doing.
I have a question/theory for you Mark.
If I was to define "Modern Aikido" as the Aikido that came out of the Hombu dojo after the war, would it be true that most/all of Aikido people who consistently train with Dan or invite him to their clubs, trace their lineage to that "Modern Aikido"?