So basically the default state when you go to high is the thing kills you but this nerd figured out a narrow set of conditions that he had to undergo to have it not kill him?

It’s not a default state, but yes he had to know all the conditions for each level and avoid them. Ironically, the killscreen is treated as the player “beating” the game as normally the game ends with the game overwhelming the player, but killscreen is the player overwhelming the game.

Also I guess this is the last achievement right? Bc from this point you can just do this over and over?

Yeah pretty much. Obviously there’s always potential in new high scores and fastest to rebirth, but this is the summit of technical achievement in the game.