Firstly, IMO, there was nothing "hell"-ish about Hubspot's culture or business model. It seems to me they were just playing the game-as-given, and doing it quite well frankly.
The proof of that is IPO.
Personally, I find it beyond refreshing that management is making a powerful effort to change up the typical gray-flannel corporate work/life thingy.
So old-school didn't get it, or even see beyond his own prejudices at the positive work culture meta-messages.
That's on him, not Hubspot.