The Messi comparison threw me, too. Maybe Alex Honnold would be a better comparison, or Ueli Steck for the European audience.
Anecdote of 1 of course... but I'd also guess that I'm not an outlier, and Messi is much better known than your two suggestions in pretty much any country.
As for the climbers, Honnold achieved some normie fame as the subject of an Oscar-winning documentary[1]. Steck was also among the best climbers ever, but his speed records centered on the Alps (hence my joking aside about the Euro audience).