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.
