Didn't notice any bias from the commentators. They were equally praiseworthy of Illott's qualifying performance, Tsunoda's recovery drive etc. Heroic may be bit of a stretch but it was a very ballsy drive from Schumacher to make the moves that he did at the start/first lap and then later in the race with a championship on the line. He could've easily have played it safe and coasted home in P6/P7. So I'd say only the people with an obvious ongoing bias against Schumacher might feel the commentators were biased.
Daruvala's defense was...overly robust and questionable at times especially his late moving under braking a couple times. He's lucky Schumacher backed out of it with his eye on the championship otherwise it likely would've ended in tears for one or both of them with defensive moves like that. Plus, the Prema's were lousy on the medium's all weekend and never looked particularly threatening on that tire.