Yes but people are arguing if it should be a pro or a new gen based on rumors. It is pointless because we have zero confirmed info. People should wait until we know more. I personally do not believe it will be the massive jump some people are making it out to be but we will have to wait and see.
I agree with you, we will only know when there is more information clarifying the situation of the supposed "Switch Pro".
Whether "should" or "should not" count on Switch sales? As I said, imho, this is defined by "content", if the "switch Pro" has Exclusives then it should not be counted.
However ... it is almost certain that the factor that will determine this will be "Nintendo's word" .... If they decide to say that it is "Switch Pro", and not "switch 2", then most of the community and sites that follow sales will consider so, regardless of having exclusives that only work on "New Switch".
Prediction: In 5 years Nintendo will Lauch a "Core Mario game" very similar to Astro Bot. That said, many will Ignore Astro Bot existence and say Nintendo created this concept.