So Larrabee lives on for... some reason. These E cores are well known to be modified Intel Atom cores and those were modified Xeon Phi cores which were Larrabee based.
Just with.... AVX512 being disabled. (Lost when Xeon Phi turned into Intel Atoms).
Intels technical strategy is completely bonkers. In a bad way. Intel invented all this tech 10 to 20 years ago but fails to have a cohesive strategy to bring it to market. There's clearly smart people there but somehow all the top level decisions are just awful