Hi Andy,
You have permission. Click on the below link and it will take you to PG Music's frequently asked questions (FAQs). You can read their clearance there.
https://www.pgmusic.com/salesfaq1.htm#22When you upload your tracks, don't reference the Realtracks as being performed by any particular artist because you have not paid anyone to actually do a recording for you. Your songs are your own work. PG Music has paid each Realtrack Artist who then signs over their work to PG Music for use with BIAB and for you to create songs with BIAB.
I've noticed over the years that some people like tagging their uploads with things like 'Drums by Craig Scott', 'Piano by Blair Masters', etc. This is not accurate because no RT artist played firsthand for these songs. The artists are actually one or two steps removed from the final product created by the songwriter. From a copyright perspective, I imagine that such information could also be counter-productive and cloud the mind of those who filter for copyright on upload sites.
In relation to using RT Artists names as having played on a song when loading a song onto a website, Peter Gannon has commented a couple of times over the years in the forums that this is not something he encourages.
Regards,
Noel