Dysag -
I suggest this topic is a red herring. He was probably carrying 3% of trip fuel as contingency, enough for 150nm.
We don't know that yet.
If that wouldn't have been enough, he'd still deviate and worry about the fuel status later.
I'm sorry, but there are "management-type" pilots, along with others, who would NOT. Not all pilots are as conservative as you (?) and I are/were.