In the comment from the RHA forum, 'Yellow Ribbons' is specifically referred to as being diploid.
"It ['Oso Easy Peachy Cream'] is triploid, but seems to have some limited fertility. It is a parent of the diploid Oso Easy Lemon Zest with the other parent being the diploid rose Yellow Ribbons."
OE Peachy Cream has quite high seed set and germination here. So high I dug it out cause I had too many of its wiry kids to cull through. Culling out the lanky, downy prone, and powdery mildew prone seedlings was a worthwhile task to get a few keepers.
I have Lemon Zest. I consider it a yellow perennial potentilla LOL. Just flops everywhere and blooms everywhere. Its kinda cute since its not too big. About as much as a rose as Red Drift is. Another perennial mimic.
If you can verify ploidy proof you should show it on HMF. HMF has farther search engine reach than RHA does.