In other news articles they're described as support troops or engineers. They'd be building things, cooking meals, driving trucks, repairing stuff. Maybe occasionally get a HIMARS dropped on them but certainly not storming trenches.
Engineering/support was the pretext for all the Chinese, Cubans, Nepalese, etc. that have ended up as frontline cannon fodder. Both Russia and NK are incentivized to downplay it until the troops are already there so I'd remain weary.