The question is, are you sure that Robert Kiyosaki did not invest in Bitcoin? Remember that he is a businessman, an influential person, and a popular tycoon businessman all over the world. Remember, people like Kiyosaki can also be said to be some of the best manipulators in business.
It seems that Kiyosaki is no different from Elon Musk; just a post on Twitter of a meme coin, there are immediately many investors who are also whales who will also buy any coin that he says. So, it's the same with Robert Kiyosaki. Maybe it's possible because what he says is that he thinks it will have an impact on the fall in the price value of Bitcoin in the market, and when that happens, Kiyosaki will enter the opportunity to sell Bitcoin. We don't know or are sure that he can do it or not, but because he is a businessman, it really maybe or maybe not.