Twin sisters? Call them game developers or entrepreneurs and if you want to highlight their sex just write out female in front but don’t degrade them them to being twin sisters.
In all your examples (and the examples the person replying to you has made) the descriptions don't lose the persons identity.
People refer to the "Winklevoss brothers" they don't appear in headlines as "Twin brothers...". They're refered to by their name, as well as the fact they're brothers - it's easier to refer to the fact that they're both Winklevoss and just say Winklevoss brothers. Whereas in this headline, the sisters' identities are erased- they only exist as twin sisters with no identity.
In all these examples - Winklevoss twins, Collison brothers, Wright Brothers, Property Brothers, Marx Brothers, Brothers Grimm, Russo Brothers... they all actually name the brothers.
The title of this article is really weird - it anonymises the businesswomen and attributes their wealth to the work of other people. I don't object to it strongly, but I do think it's a kind of backwards way of writing the title. This title could be perfectly applied to some charity kickstarter run by female gamers for some twins that are in need.
These are already famous people. As a rule, journalists don't mention names in the headline that would likely be unknown to the audience. Of course, this creates a chicken and egg problem sometimes...
I don't think any degradation is intended. It's just an interesting fact.