If that's all it was then Moyes comes out of it looking terribly inept in my opinion. Yes the player was a loon who probably deserved to be binned off but FFS do it at the end of the season, not the week before the biggest game of your entire tenure (minus the '09 final). I've defended Moyes over this the past few years, I believed the infamous break-in story because just look at the bolded comments at the top of this page! I felt there was nothing else much he (Moyes) could do but effectively dismiss Drenthe for gross misconduct.
If what Drenthe's saying is true though (and why would he lie at this point, honestly?) then all time I have for Moyes is gone. It was a culmination, not one big "OH MY GOD WHAT HAVE YOU DONE?!" type of thing. Missing a team meeting but still getting to training at a reasonable time before anyone had even started anything for the day, is that worth sacking someone over in such an important week?
He doesn't spend the interview slagging Moyes or anyone off really, he looks back at the whole experience as a great time and admits he let himself down by not trying harder to listen. He's asked point blank what happened and gives a very detailed and plausible sounding explanation. It's brought the hurt of losing that game flooding back for me, it was all so avoidable.