Premise:
"It was opened promptly, he said a word or two to the doorkeeper, then passed inside."
Hypothesis: He went in without talking to anybody.

no

Premise:
"and they were trying to do like like robotic stuff and everything"
Hypothesis: They were trying to do robotic stuff.

yes

Premise:
"namely uh replacing putting the catalytic converter back on the car"
Hypothesis: A part of the process was replacing the catalytic converter.
yes