How close is it to the chip in the VCS? Was it a step towards the 6507?
The 6507 chip was essentially a repackaged 6502 microprocessor. The game chip is pretty weird, with a custom microcontroller and a bunch of specialized circuitry. So I don't think there is any connection between them.
I had the Coleco Telstar arcade and all its cartridges, thanks to my parents. I was just a young kid at the time. Thank you for this deep dive into a chip that shaped my childhood.
If I were you, I would try to reach to the blog poster.
I've been working closely on this chip with the writer of the blog post (and with Sean Riddle who took the die photos) for the past month.