According to news.bitcoin.com: https://news.bitcoin.com/e14000-tesla-bought-bitcoin-finland/. Someone has bought a Tesla car with bitcoin, doesn't mean that Tesla officially accepts bitcoin as one of their payment methods, though because until now I've never seen a bitcoin logo on their website, probably I missed something.
And just heard from other sources that saying the bitcoin were sent through an API that converts the bitcoin to Euro right at the moment.