In the cheatsheet, it says:
ordfav:bob
Search for posts favorited by the user Bob.
fav:bob
A faster version of the favorites search, but ordered by post date instead.
But the search ordfav:albert doesn't work.
And the fav:albert ordfav:albert does work.
Therefore, apparently "ordfav" is just for ordering posts, not to "Search for posts favorited by the user Bob."