I don't follow motorsports very closely, sorry, but racing hybrids sounds extremely queer.
They might as well not do it at all.
You cannot greenwash auto racing as "sustainable" when by its very nature it need not exist. It's done for sport.
It's like people who hunt exotic animals agreeing to put suppressors on their rifles as if that somehow makes it more acceptable.
The worst thing is that, whatever they "save" in the hybrid part, is offsetted by the amount of pollution of flying all people and machines around the world.
Someone on reddit showed a graph comparing both, and it's just ridiculous.
I'm an avid F1 fan since 1990s, and think hybrid engines is the wrong way to do it.
F1 couldn't call themselves the pinnacle of motorsports if they moved away from hybrid engines. The performance advantages are fairly staggering.
There are very obvious performance benefits to running a hybrid.
In theory: it's not greenwashing, it's so that the humungous amounts of resources they put into developing F1 engines are not completely wasted ... so that some of the tech can "trickle down" to road car engines. Hence, the interest in hybrids. At least they get to learn how to charge a battery really, really fast.
In practice, of course, it's all going to go a bit south when road cars go to 90% EV. There is already a "formula E", of course.