I have a wired CST trackball mouse that is about 10 years old. Built like a tank. I believe they go by the name of "L-Trac" now (as the company was sold).
They are a little pricey, ~$200, but I love mine (so much that I bought an extra). Also, they use a pool-sized ball, so I replaced mine with a green ball.
Logitech specifically. They haven't made a wired trackball in some time, as far as I can tell. Their only options are AA battery or rechargeable. I'd rather not have to futz with batteries at all on my desktop computer
The PERIMICE-520, right there on that page that you pointed to, is a wired trackball. I know because I have one beside me right now with the wire going across the desk. (-:
To add some context to the title for you, "Building the mouse Logitech won't make", it's referring to / implying the entire PC industry including Logitech.
Which would make a statement that "they no longer make wired trackballs" a falsehood. So likely not whatever "they" basscomm had in mind, if you think about it.