A non matching plate would be probable cause to make a stop to check IMO.
Non matching plate?
I can only see that in the case of data points that cannot be changed easily by the owner.
One cannot change the make or model of their car. They can however run down to the store and grab some paint and change the color.
With all that our law enforcement has become, SWAT, no-knock, surveillance, parallel construction, manufactured cause, outright lawless behavior, etc. I no longer trust that they are acting in the public interest, but rather their own. They have lost the benefit of doubt in the view of much of the public.