Absolutely gorgeous!
TY for sharing that view. Definitely actinomorphic viewed @ the opening, (with no bend when viewed from the side, pink pollen.) That's the money-shot, IMVHO, that there is a difference between the flowers of the S. truncata plants sold as CC's, and the elusive, "true CC," S. x buckleyi.
Looks identical to the Matts Landscape CC pic (which looks slightly over-exposed, so hard to say what color the pollen is, but articles that mention pollen color of S. x buckleyi say it is pink.) Fits all the criteria for being S. x buckleyi that I've read/seen.