This is normal: Just because some republicans think evolution is a hoax, doesn't mean every republican does. Every large political organisation is actually a coalition of people with different beliefs that overlap enough to put them on the same side for now.
Hypothetically, maybe GitHub don't know much about racism, but they're very much opposed to police cruisers intentionally driving into pedestrian protesters.
That would mean they support the current protests, but as long as ICE aren't deliberately driving cars into people, they're not yet opposed to ICE.