Deductions & credits

This seems to contradict the instructions in the On Demand Tax Guidance at the bottom of the page where you enter 1098 boxes.  Multiple 1098s related to a Refinance done in 2020 says to "Hold up!" and "Grab a calculator and add the box 1 amount from each form and enter the total in TurboTax as Box 1 Mortgage interest."  Are both methods valid and should come to the same result?  I think I'd prefer to do what you say here, so that it actually has the info for both origination dates and an unambiguous amount for box 2.  Adding a comment or linking to this article would be helpful.

Thanks!