Oh, Jim -- you're so literal, and lacking in imagination!
I mean: when we talk about 'walking' a golf course we don't mean actually using our feet!
Ha! Don't you see: it's not a reference to some autonomously self-generated bipedal motion as opposed to, say, riding in a motorized cart.
No, no -- you've got to get over that, friend. Yours is an antiquated and narrow and definitely much too concrete a definition.
Think of the concept much more as an "As if" experience instead, e.g.
Which golf courses would be in the Top 10 that currently aren't if they had to be played "as if" using autonomously self-generated bipedal locomotion?
Do you see? I'm probably not explaining it well, but hopefully Tom D will chime in soon.
Btw, and needless to say: don't look to Golf Digest for such a Top 10 list -- its panelists just don't seem to get it!