Exactly. So an iMac is mobile.
There used to be a distinction between portable and mobile. Of course a laptop is portable, but it’s not mobile like a phone. There is still a need to distinguish between something that can be easily put in a backpack vs easily put in a pocket.
For those that disagree, tell me Intel didn’t intentionally say “world’s fastest mobile processor” hoping the mind would immediately make a comparison to Apple’s mobile processors.
Apple by the way distinguishes between a mobile phone processor and a portable laptop processor.