Those are not available on the open market. It really doesn't matter if they are or they aren't true AF because you are the only one that grows them...nobody else can grow them because those are specifically your seeds...
Not trying to be ignorant or anything...but we should stick to listing strains that are available on the open market. That helps a lot more than listing strains that are grown only by one or two people...
Afghan Kush Ryder is a true autoflowering plant. I have one that just started to flower. I will post pics when the flowers get bigger.
I have no experience with PKR, Taiga or Tundra.