I think there might be some truth in that. I have played over 5000 games ob chess.com. I could even begin to estimate how many games I have played in my life. Most reasonably strong chess players have played a lot of games. So if you want to become a really strong player you need to accept you will have to play a lot of games.
However, just playing lots of games and making the same mistakes over and over again does not get you anywhere. That is the problem with people who just pay blitz chess. You need to take some time to think about your games, to look at them afterwards and try to understand what worked and what didn't (and why it didn't).
It's the same with most things. I am also a drummer. Drumming lots is essential to build up the muscle memory. However, sometimes I take some time out to do some work on my technique or to read about how other people approach drumming.
I had a revelation tonight. I feel that the less I play, the stronger I feel. I've been analyzing games deeply and today when I played a few games and it felt like I knew what I was doing without feeling anxious. So the goal is to play less, analyze more.