Whoops, I was meant to type 1200 x3 (or whatever their "rolling average" threshold over 3 years is/was).As far as I'm aware it's not that P1 are exempt from it but that you get a soft landing to WP. SImilar to the OP who got a soft landing to SG from WP.
I'm not sure what the soft landing requirements are/were, I remember some time ago that there was discussion about it due to meeting the SG "average" but not the WP one (in the case of a WP, not P1).
Things might have and probably have changed now though...