Is the RTX 2060 the minimum listed Nvidia GPU?
Yes. Steam lists an RTX 2060 6GB in the minimum PC specification.
Confirmed explanation
It appears alongside hardware ray tracing, Shader Model 6.6, Windows 11 and an upscaled 1080p 30fps Low estimate.
What is not confirmed yet
Laptop equivalents, driver versions and recommended Nvidia hardware remain unspecified.