Electrek is interpreting a local subsidy agreement as though it were national law. Tesla can comply with this requirement simply by inviting a third party to provide chargers for non-Tesla vehicles on the site. They already have this at the Nebbenes site. See https://www.rb.no/nyheter/elbil/bil/apnet-verdens-storste-la... (you can use Google Translate just like Electrek did).

If this article is representative of Electrek's journalism I think everyone should take their articles with several pinches of salt.