Neanderthal
Arcane
The developers made a simple assertion about a few German tribes attitudes towards trannies. Whether is true or not, is open to debate. To dismiss it out of hand as implausible is naïve, because ancient pagan cultures are known to be diverse and too alien for today standards – hence the example of Greeks' attitudes towards homosexuality. To bring onus of proof in these discussions is foolish, because everything is open to debate until you have a sizable amount of evidence to support either hypothesis.
This is all from sources as close to the period as you can get, rather than imagining that the Norse for some reason did what a far off, foreign culture did.
References?
Thirty years o studyin subject, if you wanna follow in that path then first start reading eddas an sagas, from Snorri Sturlusson to unknown authors whose works are still published. Then i'd move on to recognised experts in the field, personally i've always liked works of Gwyn Jones, his History of the Viking Age is exhaustive and thorough. You could also have a dabble in other popular sources, Tolkien for instance and his translation of Beowulf. There are hundreds of works out there focused on the Viking Age and before, there is a substantial body of evidence from various other sources as well, the Anglo Saxon Chronicles, The Domesday Book, Church records etc.
To refute all this and make up some unproven, unmentioned an implausible connection to Ancient Greeks is utter horseshit to be honest. Pagans weren't unknowable or alien, they were human, readin the sagas or any historical document will bring this home to anybody, and they acted in a human fashion.