Doesn't matter if they didn't know what they're talking about, that was what was written on the Microsoft sites when comparing C#, VB, F#. F# was always pigeonholed into scientific and financial categories, never aimed at general code.
I'm only repeating it to point out that MS itself did poor marketing for F#, clearly favouring C#.
People at Microsoft repeatedly said "Simple Code for Simple Problems". C# programmers don't like repeating that.