It was a very good idea if you did on december 2017.
Right now i don't know it is good or bad, the time will tell us for sure.
Maybe he is right, no one can be confident in the future. Many projects are dying and many have already died, there is no guarantee that his investments will not turn into zero.
Many projects that are already dead are those that didn't have a decent direction in the first place. Though many alts are still active and i personally wouldn't let go of the good ones that havr a chance or history of recovery.