It is Dell's version of the 38GN, most likely... 144hz g-sync compatible, no hardware module, HDR600.
The price implies that it is wrong information. You can't have 38" HDR1000 with G-Sync hardware module for 1800 Dollars.It says gsync ULTIMATE so that should imply a physical module. PCMonitors also agrees:
View attachment 287456
Either the gsync ultimate spec was tweaked to include HDR600 or Alienware is giving out the wrong information.
Looks like it doesn't have any gsync module: