Deductions & credits

No, this is not an error. HSAs inherited from a deceased spouse are treated differently than ones inherited from others. 

Basically HSAs inherited from a spouse become your own HSA and there is no tax impact if it's used to pay for your medical expenses.

HSAs you inherit from someone other than a spouse are included in your income. Medical expenses you paid for the decedent within one year after the date of death are not included in your income.