RJ Has stated numerous times that he will see the end of Gas engines in his life time.Rivian is also in business to make money. That stance could easily change in the future when they see the demand from consumers for a generator option. Being against petroleum powered vehicles does not necessarily indicate a firm stance against packing around a generator for use when access to the electrical grid is not available.
Why would his company delay the inevitable?
I'm not saying it isn't possible but it is very very unlikely.
https://autos.yahoo.com/rivian-ceo-...suggested that those buying,in 1910,” he said.