It is possibly true but I doubt anyone has ever really tried it seriously.
Most people would find it extremely depressing to get slaughtered in thousands of games. Most people wouldn't be able to learn from the lessons provided by those games.
A better approach might be to play opponents who are only slightly better than you so that you have at least some chance of winning.
If I play the Computer at the highest level regularly until I win will I get better since I was told. you only get better if you play a harder opponent. is this true.