I respectfully differ in opinion...
I don't think it is a Dendrobium phalaenopsis or any of its hybrids.
This is definitely a hybrid. It is in a group of Dendrobiums commonly known collectively as "Antelope Dendrobiums". These Dendrobiums are in the section Spatulata. Whereas Dendrobium phalaenopsis is in the section Phalaenanthe.
It may have Den. gouldii in it, but I don't see it.
It is possible that it may be a cross of Den. lineale and Den. mirbelianum, idk.
I can't ID this Dendrobium beyond what I've told you though. Nice plant.