I haven't read the article but I've found this to be true personally.
I think the reason why, is that technical analysis is an analysis of the entire market opinion (price and volume) where as fundamental analysis is your opinion of the facts available.
Facts available to you depend company to company but most times it's like an iceberg, you only see the small part poking out of the sea but there is monstrous detail below that you are not privy too. This can make fundamental analysis extremely tricky as if you don't have industry knowledge to benchmark assumptions or costs given then you're blindly having to believe the estimates given.
