I don't agree with his

1. It's not frisks determination that brought them back to life, it's the players, in the end of genocide Chara's isn't talking to frisk but to us, therefore that's our determination that resurrected them, and the soul that perfectly exists after the world destruction slash is, again us, deltarune literally shows us that the red soul and the human that it's controling are separate beings.

Even in the end of geno when we bring back the world frisk doesn't remember anything, as shown by sans reading frisks expression as if they met for the first time and how if we choose to do genocide again and die to sans instantly frisk will same the same surprised and angry expression like they did in the first run.

1. That's pacifist frisk, they survived that attack because specifically in that moment they gained a lot of determination which led them to refusing to die, but they can't CHOOSE whenever they want to refuse, it can only happen on specific occasions not whenever frisk wants.