So, while it's true that the employee has been suspended, it doesn't seem to be for the reason the headline suggests.
It'd be like if an employee saved some kittens but then slapped someone's butt, and the headline is "$company fired employee who saved kittens". Not that I'm comparing kitten-saving or butt-slapping with whatever those employees did.
But to speculate and judge (hey this is the Internet after all), if they wanted to attend some meeting my guess is they thought themselves to be warriors trying to confront the evil transphobic (in their mind) corporation...