If you actually took the time to watch those videos

I’ve better things to do than to watch some dude on YouTube that lives of sensationalist video titles

And: The problem of nuclear waste disposal seems not to be solved. There is active R&D ongoing.

Source (not some Dude on YouTube):

Although many countries with nuclear power plants have programmes to develop spent fuel or HLW disposal, these programmes are at very different levels of maturity, especially as concerns the siting process and the selection of a site. Three countries, Finland, France and Sweden, have selected a site and are progressing towards licensing and construction. Other countries have time schedules to begin operation of repositories in the 2050s and 2060s and have started an active siting process. The general trend is to site such a facility in a willing and informed volunteer host community

IAEA Nuclear Energy Series; Status and Trends in Spent Fuel and Radioactive Waste Management (PDF)