PN are trialling FTTP - which means it is not generally known to all their sales & support staff.
When PN trial something, they usually start with technical trials - where the technology itself is being tested - and then gradually move to admin trials, where there systems & procedures are being trialled (including the interaction with BT wholesale and/or Openreach).
FTTP is well past the technology trials now, and is sitting in a more administrative mode. It seems likely to stay with that label until PN put together a full consumer package.
FTTC went through the same thing. My original order went through in exactly this kind of state, just prior to commercial packages being opened.
For better details, look at:
PN's Trials Page, and select the
FTTP Trial. The packages being offered match the current FTTC packages in speed & usage allowance.
This thread on the PN forum is a recent chat on the same subject.
Note that it is a trial available to their customers, so you'd need to sign up first before upgrading. There's probably a way to confirm that they'd take you on the trial before signing up.