That's not what Brendan or Mozilla said. Why don't you ask him? Has Brendan Eich or anyone else ever contradicted this:

https://blog.mozilla.org/blog/2014/04/05/faq-on-ceo-resignat...

Q: Was Brendan Eich asked to resign by the Board?

A: No. It was Brendan’s idea to resign, and in fact, once he submitted his resignation, Board members tried to get Brendan to stay at Mozilla in another C-level role.