This assumes that trans women always have penises, and that the partner is only attracted to penises.
If so then yes I could understand that someone would feel betrayed if they weren't told about this.
But this was not specified in the article and "trans attracted" doesn't have to mean "penis attracted" nor does it have to mean "unable to be attracted to cis women also". Like I said, bisexual people exist.
You should maybe specify the fact this particular husband is only attracted to trans women with penises. Because lots of trans women are post op and don't have penises anymore.