Got offered a senior role in an interview and then ghosted

I went in for an interview for two positions with 3 team members of the company, 1 of them being the CEO. After an initial explanation of the roles and me speaking a bit about my experience the CEO brings up another possibility and offers me a senior role leading a department. Obviously I think that's amazing and I accept. We speak for an hour around the various complexities and at the end of the interview he tells me to please send him an email around salary expectations. I did this the next morning after consulting various friends in the industry around expected remuneration. I've been totally ghosted since then. I've sent 2 follow up emails both of them polite and the last one asking if perhaps there was an issue around my expectations. Absolutely nuts.