Thanks hagrin. I’m assuming you’re referring to this post?
As far as I can tell, that’s only overt ASICBoost (specifically, how many bits to grind from version). Though there’s some speculation SHA256 midstates are transferred, I haven’t found any code that transfers midstates in their codebase nor any that transfer it back to the pool to say which midstate to use.
If you have evidence to the contrary, I would love to see it and would gladly write up a post about it.