I seem to remember newspaper ads in New Zealand also giving all-in prices. Certainly doing it that way wasn't the airlines' idea.
Yeah, the wording they're using now ("WARNING New government regulations require us to HIDE taxes in your fares") almost drips with cynicism.
A second one should be "WARNING! Lack of government regulation means we can HIDE fees in with the taxes!"

That said, they might well be taking a hit on sales numbers based on not being able to populate the calendar with $9s and other low numbers you can't really get. Maybe they're celebrating at Greyhound headquarters.
The right thing to do would be to eliminate the PUF and raise the fare (so it's basically the same in the calendar, but with better transparency). Methinks, though, that their legal and marketing departments are working feverishly on a creative, stay-within-the-letter-of-the-law way to be able to display the single-digit "fares" again without running afoul of new regulations.