What makes you so sure?

First of all I think it's hard to define the Internet: is it just the networking? Do you count the application layer?

From Wikipedia: The Internet is a global system of interconnected computer networks that use the standard Internet protocol suite (often called TCP/IP, although not all applications use TCP) to serve billions of users worldwide. It is a network of networks that consists of millions of private, public, academic, business, and government networks, of local to global scope, that are linked by a broad array of electronic, wireless and optical networking technologies.

But even if you wanted to include the "application layer". Who are the women that contributed to developing it?

The problem is not that women did not contribute to the Internet, the problem is saying that this means that women cannot make productive contributions to technology or the Internet or computers in general.

No it doesn't. It means that women did not contribute to the invention of the Internet. Anything else you read into that is purely your imagination.