Like, are you speaking through a persona to rile people up for fun, or is this just who you are? Either way, you do you, I guess, but I'm just curious.
It's not a computer playing, a person plans out the run and then executes the plan with the help of slow motion, save states, and frame-by-frame play. Seeing things that no human could possibly pull off unassisted is entertaining too.
TAS runs are often are less about the challenge of beating a game and more about displaying mastery in knowledge and understanding of the game's code.
Don't be discouraged if you don't get it right off the bat, even just casually viewing them requires a fundamental understanding of how games and computers work.
TAS can be considered its own competitive speedrun genre, with its own players trying to optimize and reduce times further and further. As far as I know, very few games have reached a point of being definitively 100% TAS optimized.
Additionally, TAS often is the incubator for ideas and tech that human speedrunners can adapt for their own use, too.