The genderbent MC acts exactly how a typical (shoujo manga) guy would. All protective, princess carry included.
MC is pretty much a guy inside, so it's pseudo-yuri.
It seems as if, upon learning that the character shaped like a girl had a dick and a pair of balls in the first 12 pages of the story, some yuri fans will discard all of the lessons about the arbitrary nature of gender roles that one might encounter through such a hobby, all of the 'girl princes', all of the hype moments of girls standing up for and protecting each other. Or the fact that this site, one that is known for curating yuri manga, has a dedicated tag for the Princess carry
. Incredible work.
Note also the context of this supposed moment of masculine excellence. Previously in their relationship, it was Kyouko who was known to chase away bullies, so the idea that girls are inherently meek and helpless creatures has already been rejected in this story. And Yuuri was only able to step in as Kyouko's prince, to act just as cool for the girl he loves as she once did for him, after he was turned into a girl. After his balls were swallowed by the spirit world, or whatever it is that happened to them.
I have encountered (in my opinion quite boring) gender-bender stories where the main character being "still a guy on the inside" while inhabiting a female body and persona goes completely unchallenged by the narrative, but this story is just getting started; Yuuri's understanding of their own identity may change yet. So I think it would be too early to dismiss this series as "pseudo-yuri", even without knowing that the creator designated this story as just "yuri".