Given Netflix greenlit Cuties, I view them as either actively malicious, or at the very least criminally negligent in their oversight of their own projects.

There's zero chance the "top brass" investigated Cavill for any reason. There isn't even that high a chance "top brass" even knew he was contracted to them. At best, some harpy higher up from HR with a chip on shoulder and bias plain to see had some sexist hatred for him and acted on their own volition. At best. More likely it was some lower HR.