Ah i see what you mean, medically speaking you are indeed very correct but i feel like words like introversion (and even social anxiety) have grown allot in public use where they are understood beyond the stricter scope of a medical diagnosis.

I wont use semantics to argue actual science but i do often consider that scientific definitions can and do evolve just like language. I fit quite a few criteria and have more then one diagnosis, yet i experience nuance beyond the strict definitions. I know many social events that are draining, and some that give energy, Many social settings i have anxiety about, and some where i am confident.

Yeah so if your job involves a lot of social energy you might not have enough energy to make a bunch of phone calls. Like it's a little hyperbolic, but if I have to do a lot of talking to contractors I'm taking a full half day because after that I am going to want to sleep.