It's definitely not a sanderianum primary hybrid and very unlikely to have any sanderianum in its background.
This plant is a cross between something in the cochlopetalum group (primiulinum, liemianum, glaucophyllum, etc or a hybrid from this group) and one of the multiflorals like gardneri/praestans (or a hybrid thereof). So it maybe a hybrid like Paph. Jogjae or whatever that would be called under the current classification.