I think, Bill Gates know the potential of bitcoin, the drastic change that it can give to the existing industry. This change is what he is afraid of, incuding the risk it can bring to his multi-billion business.
If you are successful with current situation, would you prefer to have change? That's what Bill Gates have in mind, probably.
Why should he fear this change, crypto and bitcoin are fields that do not have much influence on his company, it only helps the technology grow, there is no reason to be afraid, therefore summarize all, we can be very clear that this might be a lie. What Bill Gate is trying to do is to mislead the government and people, he wants to show that he does not care, even against bitcoin, that made him safe in his investment and without supervision from the government, limiting the risk to his business