A further spin-off from what you’re pointing out is the similar (yet in a sense opposite), association with mature (femihag) women, affectionately referred to as ‘Cougars’ or ‘MILFs’—
In that culture, they use terms such as girl, or chick to further enhance the paedohysterical notion that girls under 18 are ‘children’, by artificially DEflating the relative age and mature appearance of those hags as (sexy or attractive) girls.
(They are trying and I think possibly with limited success, to brainwash men into believing and accepting mature women as being as sexy or even MORE sexy and attractive than younger girls).

I remember having quite an intense belly laugh when esteemed reader ‘MRA Front’ directed me to the so-called ‘Cougar’ culture, where I saw images of ugly old hags with 18 to 20 year old boys and splashed across the top of the page was this exact phrase: “You go girl!!”
Other pages contained similar pictures and short stories of Cougar ‘conventions’, where ‘hot’ or ‘sexy’ Cougars go for the exclusive purpose of meeting young men and having sex with them and they were even referred to as ‘hot chicks’, ‘Hotties’ or ‘Gals’. I.e. words normally associated with young women and girls.

I think you might, as I do, perceive this as yet another publicity ‘trick’ (in propaganda) the gynocracy has developed and deployed, to effectively conflate all females AT or OVER the age of consent to be either women or ‘girls’, but any girls BELOW the AoC are children. And of course, any man showing the slightest sexual interest towards them (including looking at drawings of anything that looks remotely youthful), are indisputably vile paedophiles, worthy of nothing less than life in prison or death (if not already deceased); or, at the VERY least: a lifetime of public scapegoating, ridicule and stigmatization, via their highly successful: publicly accessible sex offender registry system.