Is that even enough? Hyperthreading let some of the earlier spectre exploits work faster, but as long as there's some shared cached between two cores (L2 or L3)

Is that even enough? Hyperthreading let some of the earlier spectre exploits work faster, but as long as there's some shared cached between two cores (L2 or L3), that's enough for timing variations to leak what's in that cache afaik. Maybe it's enough for this attack (unsure), but I don't think it solves speculative side-channel leaks in general.