Actually, didn't hear about this, but makes sense, Brahms clearly builds off of Beethoven.

But, have had heard the same thing that was said in the page you linked, that one of the reasons Brahms took so long in his life before he wrote a symphony is that he had to compete with Beethoven, and didn't feel it was ready until much older. Yeah, what an immense weight he must have felt to have to follow up what Beethoven had done!