You better re-read that.
The way I read it, hypothetically if both Joe and Kamala had to undergo surgery simultaneously and both were gonna be put out for 8 hours (ie incapacitated), the Secretary of State would be acting President.... not the Speaker. Blinken would hold the nuke codes. If both croaked, yes the Speaker gets it. Or in absence of a Speaker as we have right now, ProTem Patty.
Think about it B1, why would they even delineate the Cabinet hierarchy for acting President if that were not the case? There's a huge difference between incapacitation and death.
When Treefrog wakes up, he'll reaffirm this I'm sure.
That said, when my curiosity is piqued and I delve into something, I'm usually right.