it sounds like he is being flippant but he is not. people that diagnose search and fix problems are always second guessing themselves. when your hypothesis fails you run through a whole list of things trying to see if what you did along the way compromised the data. people that are paid a lot of money to solve problems nobody else can solve are very competitive. he is going against what the majority of his peers have accepted as fact not to be revisited.

the mumbling he does is a sort of checklist of items he knows will be questioned by his peers and anyone who disagrees with this narrative which right now is everyone.

the show house was on for 8 years showing exactly this. not emotional. just problem solving. he was not speaking to regular people he was speaking to his peers.

i dont know if what i am saying makes sense. he is saying he is sorry to his peers and that is why it sounds like that.