Not a lawyer, but being a Washington resident (see WA wiretapping laws) interviewing over Zoom (thus not working for that company and no having signed any forms/NDAs/waivers) I'm pretty sure someone snooping in or recording the interview without my consent is illegal.

This blame-the-victim mentality is not helpful. An employee shouldn't have to be vigilant against their bosses spying on them! Basic human norms don't disappear just because there's fine print in a contract. The idea that "ownership" of hardware gives certain people in a company unchecked power over the people who use that hardware is obscene.

Except this person doesnt seem to have been able to give informed consent, which is what German Law is actually looking for. European employment law is much more on the side of employees than in the US, where your comment's nihilism would make me guess you're located... Most GDPR infractions given have been around this exact sort of noncensensual recording and I think the GP comment should be contacting their data protection office or seeking guidance from their company CPO.