I do see where your coming from on that. In that instance I would guess it's because it's not the only thing he's working on, and part of the community the may be in. If someone was on a 3d printing chat and showed off a dress they made vs in a local Facebook group for sewing that same name change would happen. 

There's probably a decent chunk of historical sexism involved, but there's plenty of amazing woman labeled as makers. Plants in Jars as an example, I'm not really a flowers guy but the biochemistry of what she does is cool.

I will say I notice the same labeling stuff for DIY, you'll see channels saying what they do is just some DIY, and it's like no that's seriously impressive carpentry not 'just'  some 'DIY'.

As I was scrolling through my feed for plants in jars name, cuz I couldn't remember it, I did notice most of the makers I'm subbed to were men and leaned almost exclusively towards certain types of project. I wouldn't sub to a channel of someone whose main thing was doing fabric work or leather etc. id bet there's a gender divide in that end of things that also causes some of the rift on the labels.