This is not nessecarily true. It can be, but it just as easily cant be also. As an example, 2 days before a tournament in NY called On the Edge 3 I was playing a set online against
RapZiLLa54 I forget how many games exactly we played, somewhere around 20-25, but I won them all, every match. I 25-0d him.
2 days later by a twist of fate Rapzilla and I faced off at the On the Edge tournament. He beat me 2-1 and sent me to losers. Rapzilla only lives about 30 min from me, both of us have decent internet connections, the input delay was minimal, and the game hardly lagged at all.
Yet that small amount of change that exists in the online environment was the difference in him losing 25 games straight, and beating me 2 days later in person. Online changes things, it has to, there really cant be any other explanation. I seriously doubt he just "leveled up" that much in 2 days. He was always that leveled up and just couldn't show his true potential online. Some people can deal with online and some people cant.