The driver and the team have to play by the rules. If they have to ask the FIA what those rules are, something has gone wrong already. I cannot see the stewards having any obligation to answer a team's question in the heat of the moment. I would assume they have no capacity for this.
Concerning the rule itself, that seems to be quite sensible. You can't have drivers restarting from whatever position they want to. In addition you can't have a driver speeding through the field when everybody else is weaving and preparing for a restart. Quite dangerous.
I believe they would have the „time“ to answer if it‘s about Mercedes or Red Bull. I also wouldn‘t blame Alfa Romeo, you cannot know it all, right? And therefore it‘s a good move to ask what to do if you‘re insecure. If they don‘t have the capacity, I wonder what are their capabilities? I have experienced much more chaotic re-starts or in general racing moments.