I genuinely think you might be right about this. Dax likes younger girls, which he's admitted to many times, but I very much doubt he's a full blown pedo. Imagining himself as the submissive really could be the heart of his argument because that's what he does personally, and he believes Digi's horseshit because it validates his own feelings of dysphoria.
Dax has
- Made a career on over the top masculinity
- Sucked a dick at Burning Man. Not even as a drug induced chance encounter, but a premeditated cock gobbling
- Enjoyed getting pegged + sucking off the dildo
- created a female fursona for the bedroom
- used several "gender swapped" images of himself as episode thumbnails
- gone looking for studies to explain why someone would self insert as the sub in porn
and most damning of all
- displayed vast knowledge of My Little Pony lore