How anonymous would this be?

I use a laptop running Tails/Tor to go to a public wifi spot, like a coffee shop, and set up a new email account on Protonmail. Then I take that laptop to a park in the middle of the night where there’s an Xfinity hotspot and sign up for the free hour pass using that email. Then download a sensitive document.

No cameras, no people, no harddrive in the laptop. Then dispose of the laptop after use.