I think it's a false analogy. The "better players just see more moves deep" thing is a fallacy.
What is more useful for a C player: expert, master, or grand master analysis?

Their advice also may not always be simply a matter of looking specific moves ahead. Someone might tell you, for instance, that fianchettoing your Bishop in that position is not good because it's likely to get boxed up later in the game. It doesn't necessarily mean they've worked out a specific sequence of moves, just that they've had enough experience with similar games to know what might develop.
Yeah, even if you follow the advice, you still don't know unless you learn the hard way, or they teach you how to do that to someone's fianchetto.
A class C player is not some awful player who drops a knight every other move. So long as the grandmaster understands who he is talking to, there shouldn't be any problem with using his analysis.
The average fifth grade math teacher knows calculus. That doesn't mean they actually try to teach this to a fifth grader, or that a high school dropout is better able to teach fifth grade math.
You are looking over one of your games you played, and an expert, master, and grandmaster disagree on your next move, because the expert looked 4 moves deep, the master looked 5 moves deep, and the grandmaster looked 6 moves deep. The grandmaster also understands some very advanced positional chess, whereas the expert recently mastered some intermediate positional chess. You are still seeing 3 moves deep and learning positional chess. Who do you think would help you progress faster in the short run and in the long run?
I think I'd do better taking lessons from the expert. I think you need to learn to walk be before you can learn to run. I think it is good to be told what the best move is, but only the 2nd or 3rd best moves should be explained if those are the ones the class C player can understand.
But when I look online, all the annotated games for sale are grandmaster games, and some master games too.
What is your oppinion? Don't ask either what the best move is? Just have a computer blunder check it, and then study master games after I stop blundering? Often a weakening position is what forces you to give up material eventually.