"Framework" is such a poor differentiator to contrast with modern .NET (owing to the original poor naming decision in the first place--it's not like ".NET" itself is amazing) that it's hard, from a casual reading, to pick up on the fact that "Framework" is even being used a differentiator.

I propose that when people want to differentiate between the modern .NET Core vs the legacy closed source .NET implementation, the latter is referred to as "OG" .NET (in casual and business-casual contexts, at least).