I read some people managed to make it work
But I guess you should not expect official support from Dell. They have got enough TB3 problems with WD15/TB15. With the BIOS and driver updates available so far, my 9550 still temporarily freezes if I used USB devices over the WD15 and do not put the wireless card in the airplane mode.
We're listening. To answer your question, we do not have an official confirmation on the same at this point. Once the update is released, you'll surely find the same updated on our forums. We request you to check. Kindly bear with us.