I bit the bullet and went through all 100-odd guitar music publications
I've
collected over the years, from publishers around the world on every
continent,
across multiple genres (although admittedly mostly classical and
South
American). The set includes many volumes whose purpose is
purely
didactic. And yet I was only able to find three books that use
this notation.
So I suspect that "standard" isn't exactly the right word to use here.
:-)
It's probably better to say that it's the "correct" way of guitar
notation -- one
that is satisfying from a theoretician's standpoint, but
rarely used in practice.