It’s not planned obsolescence to include Helium when the medium requires it. If you want 18 TB, you’re going to need Helium (from what I know), but if you want less, you might not get it. Planned obsolescence is about planning (hence the name) to make a device worse to encourage upgrading. The device going bad after a while simply by its nature just makes the obsolescence aspect an added benefit.

Is it planned obsolescence that alkaline batteries go bad if left unused for a while? That moving parts in a car can wear out? I wouldn’t say it is.

This class of drive will typically have a design life of 5yrs at 100% duty.