Any major business is going to have an army of lawyers to look into any potential business practice. It would be trivial for them to shoot off an email to legal asking, "can we jack up the prices of our parts based on inventory levels?"

The answer might be affirmative, but that doesn't mean that doing so is a good business move. If you were in charge of sourcing at a company, and a supplier pulled that shit on you, you'd be finding a replacement supplier rightquick. If a supply will gouge you for this reason, you can be sure they will be looking for other reasons in the future.

TL;DR: price gouging, even if legal, is bad optics.