I am not sure that it is Rhy. Chorchalood or not.
It looks very much like a semi alba form of Rhy. gigantea.
(Rhy. Chorchalood is the cross between Rhy. retusa and Rhy. gigantea.)
Philipp, I think it is a cross. The flowers were loosely arranged and the inflorescence looked more elongated which disclosed it had Rhy. retusa in it.