I believe your response to be incorrect. On the SS Benefits worksheet, line 3, it specifically ask to add the income amounts from lines1, 2b, 4b, 5b, 7 and Sched 1 (Form 1040), line 9. Line 9 is AFTER the 10,200 exclusion for Unemployment Benefits under ARPA, which shows up on line 8 as a negative amount (-10,200 if the total unemployment benefits were over that amount)
In TurboTax Home and Business 2020, there is an anomaly regarding this. While the figure calculated on line 3 uses all the above lines from the 1040, when it comes to the amount for Sched. 1, line 9, the exclusion amount of $10,200 is added back to the total. Here is the anomaly: When you click on the figure in the forms view and select Data Source, the breakdown includes the correct amount for what shows on Sched 1, line9. I had to override the figure in Forms view to delete the $10,200 which was erroneously included in the line 3 total.
