We cannot officially comment on thunderbolt support yet.
With that said,
The laptop has the 4 physical ports split into two logical PCIE devices. With the ports on the left side going to one controller and the ports on the right side going to the second controller. So I think if you were ok with 2 ports on one side going to your VM, I think you could use the ports on the other side with your host OS.
I have not validated this, so no guarantees on this actually working or being correct. But if you get to test this out, it would be great to post your results.