All indefinitely means is “not certain”. So it could mean a week… Or a century.

These disks are pretty well understood. You should be good for a decade. At about 12-13 years it’s risky and anything after 15… If it’s still working, count yourself lucky.

Exactly. Maybe someone could have mentioned this during election season if it was so important?

I think you misread. He said “disguising”, which only means intent to keep hidden by masking the truth.