You are right. That was not a very good description of an expert skier. IMO offcourse. Gate racers typically dont have the time or the equipment to ski other terrain than specially prepared gromers and racing tracks. Some times on camps if it dumps for days and its impossible to even clear a SL track from soft snow they can ski powder on a gromer but that is it. .
Disagree/Bushwacker in post after your I agree with, based on what I have seen and know.
You see a lot of good skiers that are lousy racers but you never see a good racer who is a lousy skier.
This is in a way where the sport has gone wrong. The performance level of todays skiing is so high that nobody really can master it all. One guy that can do it all is Lahtela, olympic gold medal bump skier, but he is an exeption and a full time pro skier. He is a true expert skier but if you raice the bar that high then we can pritty much name them all.
Typically if you are wondering about your level you are not an expert skier.