That's what I thought but then the article says it's supposed to be "with unbroken footsteps". I thought that literally was impossible in modern society and i guess it is
Depends on what you mean by “unbroken”.
I’d assume that when he ran into legal issues like after crossing the Bering Strait the authorities would transport him via a car or bus so it’s not like he never took a motorized transport.
He doesn't. He walks some, marks where he stopped, takes a break, continues from where he left off.