Don't try to describe what's been happening as a communication issue. The very fact that the re-interview has been canceled means they were planned to begin with, and that confirms pretty much everything that has been reported.
If your security team asks for more time to test your stuff, it doesn't matter how polite the CEO is when he denies the request (actually, it is also important), the very fact that the request was dismissed is TERRIBLE.
The first product Proton sell is TRUST, not a f***ing wallet app, and right now that product is severely lacking.
I don't see how anyone that does so much harm to a company can keep being employed. The CEO and CTO - along with any manager that took part in this mess - need to go, and fast.
I won't renew my subscription if that fails to happen.