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Why is it better than unmatched 401k?
Once you hit 65, you can withdraw HSA funds for any purpose, tax free, like a Roth IRA. 401k withdrawals will be taxed as ordinary income, so an HSA dollar is worth about $1.20 in a 401k.
401k money is taxable as regular income on withdrawal. The expectation is you will be in a lower tax bracket after retiring, so you win.
HSA is not taxable, although I don’t know if that’s just when used for medical expenses
After 65 they don’t audit what you withdraw for.