PBN is the rule book.
In that book are the definitions of different types of navigation (specifications).
They are either called RNP or RNAV.
There used to be a rule book called RNP.
Everyone ignored it and did their own thing.
So If I use the new book to design a procedure I need to make sure everyone knows I used that book and not a previous one. So I call it PBN and specifically one of the methods in that book, in your case RNAV1.
Unfortunately ICAO are idiots only interested in keeping themselves in work so they have screwed up the new book.