That's not particularly accurate. Windows NT was based on VMS. OS/2 is quite different. The interfaces are related, but the same is true for all Windows variants on the grand timeline.
The good news is that if you are feeling particularly nostalgic and have a 16 or 32 bit processor (or emulator), you can relive the OS/2 glory days with ArcaOS from https://www.arcanoae.com/arcaos/ It'll cost you about $130 for a personal license, but if you want it, it's still there, and still supported.
