I’m sorry for the confusion.
This comes from the rules linked on the website, I assume. The implementation on this variant allows for a wide range of configurations (players are assigned a primary colour and optionally a secondary colour). The rules description takes this into account and as a result, it may come across as a bit vague.
Those can be seen as “Base Rules” we play with, but our setup is more specific. I wrote about it in the first post of the setup thread: https://forums.online-go.com/t/setup-fractional-go-5/56517
Yes and no. For the capture rule, both colours require having liberties. Ultimately it’s intended to be a competition between team black and team white.