Tacit knowledge sounds like an untestable phenomenon, and simply lacking the words to describe certain neuromotor techniques doesn't mean that it cannot be communicated explicitly in theory. Perhaps in the future we'll have a way to stimulate the brain in exactly the right way in order to communicate how to keep your balance on (aka "ride") a bike.

Furthermore, articles that downplay the importance of practice, to me, seem like a bad idea. In my experience, people who claim a high level of general comprehension (but not technical) tend to lack the ability to implement any facet of their "tacit knowledge" at even a basic level.