Only up to 11th gen... it didn't seem like this could have been disclosed to Intel soon enough for them to have fixed it for 12th gen, so had they just happened

Only up to 11th gen... it didn't seem like this could have been disclosed to Intel soon enough for them to have fixed it for 12th gen, so had they just happened to fix it while fixing something else, or what? Decided to look in the paper and "Intel states that newer CPUs such as Alder Lake, Raptor Lake, and Sapphire Rapids are unaffected, although not a security consideration and seems just a side effect of a significantly modified architecture." So basically they just randomly fixed it, or at least made this particular exploit nonworkable.