Ohh that makes sense!
Now that I am looking at it again, I wonder if those buttons you circled are actually little plungers that push the joycon away from the body to help release it.
Edit: Whatever way they attach, I hope the new joycons don’t loosen and flex like some of the current joycons do. Some of my joycons have “wobble” when attached and it makes me sad.
Not that I know of. Unless someone has stated their gender or pronouns, I just use people’s names and avoid anything that assumes or implies gender.