The point is valid.
When Blane was a player, he needed to only worry about his character and the occasional joke/pop culture reference.
Now that he is DMing, he needs to control the game, non-player characters, player characters for oft-absent regular players, AND try to throw in zingers and 1 liners. The umms and uuhs are likely unconscious as he searches for what to say or do.
Unfortunately, I feel (just my opinion), he is not up to the task of DMing. Frequent dead air as he looks up rules, forgetting how weapons/spells work, forgetting a main characters name(!!) he is controlling, and very repetitive combats (you hear hooves police coming on horseback, you hear hooves police coming on horseback, you hear hooves police coming on horseback, or you hear xylophone music skeletons coming, you hear xylophone music skeletons coming, you hear xylophone music skeletons coming). Blane is clearly overwhelmed as DM.
I always anticipated Wednesdays for the new episodes, and the last 2 weeks I find that I have not even finished the prior week's session before the new episode is out.
Flame suit on.