Yes but if they put few superchargers there more people would drove teslas there, including me.
Relatively small population, most of them in the are of St John's, and the EV market isn't very strong, so not a priority to get in and serve the island's population.
For visitors, to drive a Tesla to Newfoundland you first need to drive to North Sydney, NS.
It's 419km from the Supercharger in Aulac, NB to the ferry in North Sydney, NS. So Tesla first needs to build its planned Superchargers (see their findus page) in the New Glasgow, NS and Auld's Cove, NS areas.
Then you need to catch a ferry, year round to Port aux Basques, NL, or summer (and an extra 105 per car and 65 per person each way) to Argentina, NL.
Argentina, NL to St John's, NL is 131.6km.
Port aux Basques, NL to St John's, NL is 1080km
So, to provide reasonable service Tesla will need to:
- build the planned Superchargers in Nova Scotia
- build a bunch of Superchargers between Port aux Basques, NL and St John's, NL.
Not saying it'll never happen, but you have to be realistic that it's not going to happen quickly, it'd happen _after_ connecting Cape Breton, NS, and the multiple Superchargers required properly to cover the whole of the TCH in Newfoundland, would probably make it a low priority.
Assuming they eventually do it, I would expect them to work west from St John's, NL to start with the most populous area first.