If they’re asking someone who is not themself to take a photo, the photo in question is, by definition, not a selfie.
As for the selfie, I’m on the fence on your semantic definition. I consider myself to be a meat flavoured selfie stick when asked. I’m merely a tool that happened to be walking past that is good for pointing their device at a bulbous ass obscuring the scenery.
But I have literally (in its original meaning!) never heard anyone but gw99 describe “pictures of myself taken by a bystander” as a selfie.
I’ve taken a lot of posed photos of tourists with their own cameras, I don’t see why “the camera is now a phone” would make that phenomenon merge with the specific thing people do with the front facing camera.
“Me, posed at destination” seems like a wholly distinct phenomenon to me.
Well, the wandering nature of the word has been linguistically noted since at least 2014 by my knowledge[1]. Read more linguist blogs, I guess?