Except Boston Dynamics is a large well-funded, dedicated operation with probably the best robotics people money can buy. Also, they've been it for years and even then their top end humanoid stuff is still super bulky compared to what Elon showed today in their concept.
Also considering Tesla use all 3rd-party assembly-arms in their factories to build their cars, I'm having trouble seeing Tesla shipping anything this sleek and compact to a consumer market..