I think you’re kinda missing the context of the whole situation. This is a guy trying to cheer up a friend whose dealing with severe depression after(from his perspective) his former friend/her ex-husband turned out to be a genocidal maniac who admitted to viewing Debbie as nothing more than a pet and murdered thousands of innocent people just to make a point to his son, of whom he almost savagely beat to death. Art has no reason to be respectful of Nolan and every reason to diminish him as being nothing more than an asshole, especially when Debbie is in so much pain and questioning her life’s worth.
It should also be noted that Nolan was rarely ever in that much danger while on Earth. The closest he ever got to dying was his fight against the Guardians of the Globe, which even then he managed to curb stomp most of them despite them being the most powerful heroes on the planet.
Personally I think the show is probably going to have some fatigue issues when we really get into all the the alternate reality/timeline shenanigans that cause the major time skips. I wouldn’t be surprised if the show cuts out/replaces stuff like the arc where Invincible gets sent back to the start of the series since while it’s a fun idea to explore in a comic, I feel like in a show where you only get 1 season every 2-3 years that kind of stuff would kill the pacing of the show and make it feel like it’s wasting time.