Alasakball is referring to the content of the BBC article they linked.

“Quite frankly they don’t stand a chance. They are being thrown into the meat grinder with little chance of survival. They are cannon fodder, and the Russian officers care even less for them than they do for their own men.”

this is the reporting that has no evidence, and is contradicted by South Korean intelligence according to the other two articles they linked.

so yes, they’re there, but it seems like they’re in support roles more than combat.