Nothing in the original announcement from Acer for the XG270HU mentions Adaptive Sync, nor does your linked announcement article, which points to another Toms article that you wrote. Going back through the linked articles nothing actually links to the Acer announcement form Jan 3.
If you have further information, from Acer, about the XG270HU, and can provide a link to the original source, showing that Acer is even going to release a VESA Adaptive Sync monitor, please share.