And there’s the rub. Nuclear power has been around for 70+ years - and this is the first long-term waste storage site being constructed.
All the other storage sites are either stopgap solutions or superfund sites if you look closer.
Not to mention that 100,000 years isn’t long enough for plutonium. That would be in the neighbourhood of 300,000+ years.
Which is roughly the timespan that humans more or less like us have walked the Earth so far.