I think you have it wrong. it's 210,9 I am questioning. Are you working on a Windows miner that supports 210,9?
Yeah, it wasn't anyone posting here that "got it wrong" except maybe you:
You say "* Solver for equihash 200,9 has been deleted." and "I'll probably return 200,9 variant later"
Can you confirm that you are working on a Windows miner for 200,9?
People can only go by the info you give them and not read your mind.