Progeny of Phal equestris are more likely to stripe than to spot, but you will see some spots too, given the right other parent. It also depends on what type of equestris you use; P. equestris rosea tends to give smoother even color or fine spotting, the other types tend to give more stiping. Also, P. violacea (as opposed to P. bellina, which was called violacea borneo form during much of the early hybridizing with it), can impart fine spotting in the right combinations, very similar to what is on the Equilacea above.
You can see very similar patterning on this violacea hybrid:
I think if you want to stipulate that the Equilacea flower is correctly labeled, then the spotting came from both parents in varying degrees.
The spotting is much more distinct than I would expect, but that doesn't mean it would rule out the parentage. The size is much larger than I would expect, but that also doesn't necessarily rule out the parentage. If anything would, the size would trouble me more than the coloration, when it comes to confidence in the labeling.
Nice patterning, by the way. Attractive.