The Wolfpack do not exist in the series mainsteam canon, but they do exist in the ORC universe. Think of it like marvel comics there are mutiple universes so they can do what they want without effecting the main story.
There isn't a 'real' and 'fake' when you're talking about licensed works of fiction. It's just that they take place in separate universes. DC and Marvel Comics do it all the time. That's why DC had a Superman story where he's leading the Soviet Union through universal Communism.
I decided to go with the team choose their time they want to play that day, due to the lack of time to establish a time conveniently with everyone. You need to talk to your team and decide what time your team would like to do their event and tell me asap. Thank you -Necro
Of course not Umbrella is a fictional company the thing with Ian Sider was an ARG or Alternate Reality Game, normally these are done to represent and promote a game so no Umbrella will not come to your house and kill you.