No, that online Tesla parts store has been available for years in the USA. Although there are a few other random countries that have it, places like the UK still don’t, so I wouldn’t hold your breath here in Australia.parts heading has only just been added to the shop page, and with a lot of Teslas heading to Australia, they will add our region. they have to add all the catalogue items yet though.
For the Model S and X here there is a one-page PDF of parts you can order via the service centres, but nothing for the 3 yet.