Thank you, it's amazing how people don't even try to understand what words mean before dismissing it. Flipped makes way more sense anyway since lectures aren't terribly interactive. Being able to pause/replay/skip around in lectures is underrated.
And not watching lectures is not the same as not reviewing the material. I generally prefer textbooks and working through proofs or practice problems by hand. If I listen to someone describe something technical I zone out too quickly. The only exception seems to be if I'm able to work ahead enough that the lecture feels like review. Then I'm able to engage.
I myself am one of them, but I attribute that to the fact that this is a graduate version of an undergrad class I took two years ago (but have to take the grad version for degree requirements). Instead, I've been skimming the posted exercises and assessing myself which specific topics I need to brush up on.