I can pistol on a raised surface, like a box or DB flat bench where I don't have to hold my other leg up quite as high as a pistol on the floor. I used to do them on Bosu balls, with the black (flat) side up, before I knew much better. I was doing sets of at least 10 with each leg. Is that what a platform pistol is?
I can roll up from my back, plant one foot next to my ass, leave the other extended in front of me, and stand up. Is that what pistol rollup means?
Despite the impression I apparently give off around here, I'm not a big fat powerlifter who squats 600 lbs. I'm a medium-small, relatively mobile and agile Brazilian Jiu Jitsu dude who has added 15 lbs of LBM and ~300 to my PL total (spread among the 3 lifts) in a year and a half of intelligently programmed barbell lifting and shocked myself with the effect of the additional strength on my Jiu Jitsu game. Aren't the recent converts always the biggest zealots? I'm just following the rules