Robert Kiyosaki has claimed that its the right time to buy Bitcoins because Buffet has dumped his banking stocks
You don't just buy bitcoin because someone else is selling their other stocks, that's bad grounds to make investment advice on because bitcoin is not correlated to bank stocks in the first place.
When buying bitcoin for the purpose of investing, you're supposed to choose the timing based on fundamental analysis. Some investor out there selling their stocks of banks does not constitute as analysis remotely related to bitcoin. You could use it as a signal to sell the bank stocks in question though.