Why majority of you are seeing male MC as trans woman?
This gender bender situation clearly shows that he is becoming trans man
I don't think any definitions are clear in this particular scenario. The way I understand it (I'm agender by the way), trans men are those who were assigned female at birth, but identify as male. So that wouldn't quite fit this particular character. At the same time, it would be strange to just call them a regular cis man during the body swap episodes, because their experiences aren't those of other cis men. You could call them a trans woman if it's revealed that they identify as female (meaning: assigned male, identify as female), but they wouldn't be a regular run off the mill trans woman either.
In essence, language falls short here, there are no words to describe this type of scenario.