XPS with USB-C port... compatible with Thunderbolt devices (including previous generations)?

Hi,

I'm looking at purchasing an XPS 8910/8920, which has has a USB-C port.  From what I've read, it appears USB-C ports are compatible with thunderbolt 3 devices (both physical and protocol).

Will the USB-C port also be compatible with thunderbolt 1 or thunderbolt 2 devices, via an adapter (ie. http://www.macworld.com/article/3136177/macs/yet-another-apple-dongle-apple-thunderbolt-3-usb-c-to-thunderbolt-2-adapter-now-available.html)?

I'm asking as I have a thunderbolt (first generation) device currently connected to a (now defective) Mac and I'm looking at switching this to a PC.  I'd prefer going through the integrated USB-C port if compatible, rather than adding a Thunderbolt PCIe card, which get mixed reviews.

Thanks