After reviewing the breeding patterns and offsprings of venustum, and reading everyone's input on here, there seems to be two sides that are valid.
First, it is true there is no phenotypic evidence of the henryanum in this flower whatsoever. What you see is what you get. A flower that looks like the pure venustum album.
Second, as Phred has put it well, that venustum genes are so strong, it can wipe out other strong genes... even those of sukhakulii and mastersianum! This can be seen in Paph. Jacob's Dream, which is 62.38% venustum, 24.75% sukhakulii and 12.87% mastersianum. JD looks like a venustum as well (see OrchidWiz). Also some cultivars of Magical Venus, Deceptively Venus and Tuffet can look like venustums to the untrained and even trained eyes (all these hybrids are F1 offsprings of venustums).
In light of this information, it is possible that this flower is of hybrid origin, even if henryanum is not evident. The only way to tell is to self it and see what the offsprings look like. And that I have no time for LOL.
In the meantime I will wait for further clarification from Zepyrus who promised to look into it. The answer will come from them one way or another.