Nom, that’s not true. Chazal talk about toras eretz yisroel in several places, aside from the mitzvos (and averos) that occur there being on a higher level in general.
That being said, some learn better in chutz laaretz, including myself; there are fewer distractions here, less drama, easier to get by financially, etc… nothing about the land itself, just the current lifestyle that is necessary there at this time isn’t for everyone.