tl;dr - You’re overthinking it :)
Regarding the “dickgirl vs trans” thing, the context is drawings of fictional characters so calling them “dickgirls” or “futas” is not the same as having a community of the same name for real people.
The PC Master Race community on another instance had a similar discussion a while ago about a potential name change for obvious reasons. Most people chose to keep the current name because it really doesn’t matter that much.
We’re all aware that nobody in that community actually believes there is a “master race”, much like we’re all aware that trans people are people too, and deserve the same respect and rights as everyone else.
This is all also ignoring the very real possibility that the character(s) the artist drew are just… not trans. There are many art pieces and doujins that involve a girl acquiring a dick in one way or another without really wanting one. They never felt that they weren’t comfortable in their own body, and some vocalize that they’d prefer to go back to the way they were. This does not seem at all in line with the trans movement, so I think implying that (boobs + penis = trans) is simply not correct.
I still have more to say on the topic, but this should hopefully get the point across.
I saw “benevolent dictator” and immediately thought of this video again