As others have said, the "hidden gene woma" appears to be a single gene mutation.
The real hidden gene is a mutation that combines with lesser to make platy. If a lesser had the hidden gene it would already be a platy. The hidden gene mutation doesn't seem to show up combined with the wild type or even when homozygous. However, it has a big effect when combined with lesser and perhaps also other members of the blue eyed leucistic allele complex. Hidden does appear to be an allele (different version) of the blue eyed leucistic complex so a platy gives each offspring one version or the other (lesser or hidden) but not both and not neither.
I've not heard of the hidden gene allele having any effect on mutations not in the blue eyed leucistic combination but I guess we can't be sure until someone tries those combos but I wouldn't expect anything.