I fully agree it's not as black and white as that, I just remember gettign into arguments with them because the assumption was always that I didn't know what IS/IP was and the general position that it was something lacking from aikido.
IMO, it's a big leap from saying that Koichi Tohei has some good skills to saying that I therefore understand what Mike or Dan is saying about IS/IP. The "we already do that" reaction is very common and, IME, almost always mistaken.
And yes, I think that it's generally lacking in modern Aikido. Anyway, no point in revisiting that argument, Dan holds workshops all year
for those who are interested in seeing for themselves.