Yeah i recall MP taking some shots at James. It is true that James had let himself a bit during the Six Degrees tour and you can tell from some bootlegs, it is also documented in the Lifting Shadows book that the band had kind of an intervention where they told him he should get back in shape and work a bit more on his stage presence and his vocals. That's also a reason he was hanging out on stage in instrumental sections with a tambourine, if i recall correctly there was a place in the stage at some point with some percussion stuff for him.
I really wonder how/when things went south between MP and James, since they seemed to actually be good friends during the first DT years. Maybe MP took it personally that many people criticised James as the weak link of the band ever since the accident happened to him.
On the interview part, it was a great one, with interesting questions asked. And James is being quite open about all that he's been through, and it's been a lot. He's a very hard working vocalist, touring very hard and he even ignored doctor's advice and went on tour after the accident. I admire his work ethic and i think he's been pretty solid for the most part of his career.