No wait! I read something about this! Those were totally different brussel sprouts! I guess they came up with a new species that didn't such so bad and that's why brussel sprouts suddenly got tolerable.
Now I have to go see how much of this is true.
Edit: What do you know? All of it! https://www.npr.org/sections/thesalt/2019/10/30/773457637/from-culinary-dud-to-stud-how-dutch-plant-breeders-built-our-brussels-sprouts-bo
It actually would.