I see a lot of people complaining that the Fairphone 6 doesn’t have an Aux jack.
Just use an adapter cable.
A 3.5mm Aux jack takes up a significant amount of space just to connect a few wires that could be connected through USB-C anyway, that space could be used for a bigger battery.
Even if there was a good enough reason to keep Aux it should be 2.5mm Aux and not the usual 3.5 as it does exactly the same thing but uses less space
Weird descriptions is just how Aliexpress is. I think your right, the first one is a bad example, but there are definitely ones that work, I have one at home that explicitly marks the charge side and audio side.
Never tested it properly though, so YMMV.
The existence of these adapters does make me beleive that if apple/samsung/etc wanted to, they could trivially include an official one for $10 or so.