Yeah a lot of this is terribly inaccurate and the fact that it's being used to sell questionable advice makes it even more so. For example...

Jimmy Hendrix might have loved to play the guitar but his gimmick was playing it competently with his teeth and I guarantee you that's something he had to work hard to be able to do right.

Einstein did say Imagination is more important than Knowledge but he also said...

knowledge must continually be renewed by ceaseless effort, if it is not to be lost. It resembles a statue of marble which stands in the desert and is continually threatened with burial by the shifting sand. The hands of service must ever be at work, in order that the marble continue to lastingly shine in the sun. To these serving hands mine shall also belong.

So clearly he thought it important to "read what is written" too.

Hendrix also had the gimmick of leading a band that played excellent music, which is potentially a bigger explanatory factor in his success.

Was he not the songwriter? Is it not harder to lead than to follow?

Or are you just saying teeth aren't that important in the grand scheme of things?

"Gimmick" was meant to be sarcastic.

yeah. the author has put the cart before the horse. to be able "float like a butterfly and sting like a bee" was the outcome of hard work.

effort comes first, effortlessness comes later.