https://www.pcgamer.com/freesync-2-hdr-explained/

AMD is rebranding its FreeSync 2 technology to 'FreeSync 2 HDR' in order to reflect one of the biggest changes versus the original FreeSync spec, which is HDR (high dynamic range) support. Makes sense, right? Well, there's been some confusion over the spec, and specifically over the requirements for a monitor maker to slap a FreeSync 2 HDR badge on an existing FreeSync 2 display.

The confusion stems from an interview PC Perspective conducted with Antal Tungler, who is a senior marketing manager at AMD. During the interview, Tungler goes over the specifications for FreeSync 2 HDR, saying it basically meets VESA's DisplayHDR 600 certification. You can check it out below, starting at around the 16m23sec mark: