The only problem, what's going to happen when their supply of liquid nitrogen gets cut off ?
Organizations don't last forever, no matter how big and permanent they might seem now. Things in storage will eventually fall into neglect, and there won't always be someone to step in and supply the liquid nitrogen. Or there could be supply problems. Doesn't matter how temporary, it only takes 1 week for those seeds to go without cryogenic freezing and then they're done for.
This is only a temporary solution.
I wonder how many ancient fruit varieties no longer survive today? Wars, government collapses, government departments being shut down, severe economic and financial difficulties...