Tracking by a credit card: 100% happening. If that's a problem for you you definitly should pay by cash or use a privacy preserving card like the author does.
The app looking at history of WiFi hotspots to expose you: Pretty unlikely. Tethering to prevent "a record of a home wifi connection point" is really low value work.
> our use of the ALPR Data is limited to the following purposes:
> * To enhance your experience while visiting such properties such as, for example, by assisting in locating a lost vehicle;
> * To prevent unauthorized use of our facilities; and
> * To detect, investigate and prevent activities that may violate our policies, be illegal, or otherwise impact the safety and security of our guests and/or third parties.
Verifying who is there, why they're there there, CYA for when they screw up, and probably looking for reasons to remove you.
Why do you assume that? Disney is a major multinational corporation. It's hard for me to believe that such companies are willing to leave money on the table.