Deductions & credits

The message is correct. The IRS considers any contributions made by your employer OR made by you by means of a payroll deduction scheme to be "an employer's contribution".

The rationale is that both amounts are pre-tax. This amount is found with code "W" in box 12 on your W-2.

Since California does not allow the exclusion of HSA contributions from state income, the amount is added back to your federal income for purposes of the state.

The confusion is rooted in how the IRS uses the terminology,and TurboTax has to follow that terminology.