again we are talking about a 700 who played like 3 games not a 2000
Well they need to play more games and that's on them. The issue with telling lower rated players not to learn openings is that you are essentially telling them to not bother improving at the game.
Understanding opening play and learning how to punish incorrect opening play can win you games. The opponent could do something wrong and they won't know how to punish it because they were taught by some people that opening moves don't matter. You can just play any random moves and who cares, apparently.
Telling a 700 rated player not to learn openings is great advice if you're talking about someone who doesn't care about improving at the game at all and is fine staying at the same level or worse forever. However, it's horrible advice if the person wants to get better and reach a higher level. Learning good opening play is a part of that.
Don't listen to anyone who says openings don't matter.
Exactly. People who say this have no idea what they're talking about. Improving your opening play and understanding openings is a part of improving at the game.