As of the beginning of November 2015? I must have just made the cut-off. I bought both the P3P and 2 year ST warranty from BH in October. That's the only way it works, or used to work. Both have/had to be bought from BH at the same time.
So here's my story: Had an incident with drift into a tree and bent the gimbal. Filed an online claim with ST for the gimbal and they immediately closed my claim saying that the waiting period wasn't over yet, sending me an email much like the original poster got. I live-chatted with BH and they said there is no waiting period.
The next morning I called ST and the guy said yes, I'm covered. My thought is that ST might have a sketchy practice of denying at first to see how many people argue. I've had a lot of ST warranties, but this was my first claim.
Anyway, so I send just the gimbal in to ST as that's all I needed. In the mean time, I bought a new gimbal from BH as they ship overnight and I didn't want to be down for as long as the process was going to take. Figured I 'd keep the repaired gimbal or ebay it. The process took longer than they said it would, but I eventually got notice that a repaired unit was shipped back to me.
I had it shipped to work to avoid a must-sign issue and when I picked it up, it was a big 10-pound box, not a small 1-pound, gimbal-sized box. They sent me an entire P3P kit! Bird, battery, SD card, RC, 8 props, gimbal. Yes, it's a used, returned, was-crashed, now-repaired unit. The bird is scratched, the RC and gimbal are dirty, etc. But for $162 warranty, I now have two complete P3Ps.
Wife says to be prepared for ST to come calling when some guy gets just a gimbal and not a whole kit.