Those timeline predictions, like almost all of Kurzweil’s and Kaku’s time predictions, were wrong. They both have a very poor track record regarding timeline predictions on almost anything, so poor that we should probably pay them no mind any longer.

However, both Kurzweil and Kaku (and others) have still made many plausible predictions about what might occur with probability - it’s just (all evidence suggests) that they have no more idea when those things will occur than you do.