You are confusing gender bending with gender swapping.
Check:
https://en.wikipedia.org/wiki/Gender_bender
and
https://en.wikipedia.org/wiki/Otokonoko
What is depicted in this manga isn't genderbending, it's genderswapping. In fact, mangadex itself has a genderswap tag and uses crossdressing tag for genderbending mangas.
Why do you thing it's delusions? Have you talked with trans people about it? If you did, you'd know it's common.
Don't cite Wikipedia as a source, did your teacher never tell you that?
Gender bending, as far as the fandom has always been concerned and always will be, is the act of a a person of one biological sex being magically changed into the opposite biological sex either via magical change or body swapping. That's it. Nothing else falls under the gender bender tag, certainly nothing to do with traps or crossdressing and trans is never gender bender.
Why do you thing it's delusions?
Take two men. One of them gets hit with a "turn into a girl magic spell", the other gets hormone therapy and surgery etc. The first one was genderbent, the second one is trans.
The two of them proceed to live out the rest of their natural lives and eventually die and are buried. Time passes and a thousand years later with no context available to them, Archaeologists dig up the bones and conclude the first one was a woman and the latter one was a man. That's the difference, the former has to try and convince people they're really a man because physically they're 100% a woman and the magic has effectively rewritten history as if their body was always female, while the latter has to convince people of the opposite because they are not women biologically and they are still missing the relevant organs as well as the fact that their body's growth as a man up to that point is still set in stone.
In all of human history so far, exactly 0 trans people have changed their sex. They've legally changed their gender, but that is not your biological sex. You say you were born in the wrong body and want to try and fix that? Great, work hard and do your best to live true to that, perhaps it will bring you comfort. Transitional surgery and drugs however are not a magic spell and should never be mistaken as such, and as for people who call themselves "trans" rather than as a "woman" or as a "man" and nothing else then I have to greatly question their motives, because if you believe you're really a woman mentally then why would you ever do anything or call yourself anything that would cast doubt on that 'fact'? Just be a woman and call yourself as such, end of story.