The other thing is that this clause is intended to target those for whom their Tesla is their primary business and not incidental to it - namely, Uber drivers, car rental/hire companies, etc. where income is directly earned as a result of the vehicle being used. If the usage is incidental, i.e. your primary business is making widgets and you are using your business-registered car to visit clients A, B and C then I doubt Tesla would say you can’t use a Supercharger.
The issue Tesla is mainly concerned about is not the cost of the electricity but Superchargers being occupied / blocked up by people directly making money out of their cars. That’s not the purpose for which the Supercharger network was built nor dimensioned. If you are buying Teslas to directly make money out of them, you should install your own dedicated charging facility and use that.