I have seen nothing to indicate that the pilot make the announcement on July 26 has been fired. He very carefully didn't state a political point. He advised all passengers about the protests and asked all HKers (in Cantonese) to "take care and stay strong".
One was fired for being accused of rioting (what happened to innocent until proved guilty?) and the other for posting a pic in LIHKG (a Reddit-like forum) of a message on a screen in the cockpit. Details (including the picture) here:
https://www.hongkongfp.com/2019/08/1...ssure-beijing/