can't recall atm. At least on the Asfinag website it shows up with toilets, but it seems like that's the default and there aren't any rest areas listed that don't have toilets

https://www.asfinag.at/parken-rasten/rastanlagensuche/?facetFilter=%7B"type":%5B"pp"%5D%7D

it had a toilets=no years ago, which was set by some large area edits and subsequently reverted, see https://www.openstreetmap.org/changeset/44574220