I understand that distinction. Russell came up with a mathematically rigorous theory for the foundations of mathematics and happened to use a very simple type s

I understand that distinction. Russell came up with a mathematically rigorous theory for the foundations of mathematics and happened to use a very simple type system to accomplish it. He wasn't the first to formally make use of types, though he may have been the first to use that term. He also seriously pushed forward our techniques of mathematical rigor, so in some sense he "invented" many, many, many things. To be clear, I think Russell was an amazing mathematician and inventor. I also think that the history of types is way more rich and interesting than just saying that he invented the idea. To not mention at least Frege is to miss a lot.