That's irrelevant. It matters because if you pay for the same product you should be given the same specs as someone who buys the same product a week later. Beyond that, for SSD aftermarket installations - it DOES matter, as SATA 3 drives can saturate 6Gb/s.
Let me put it another way - I would ask to see screen grabs of anybody who thinks they have a superdrive connected to a 6Gbps SATA port, namely port 1. Nothing I've read suggested Apple had received any defective chipsets (in fact one review checked the revision of their review model and found it was the one with the fix included) and that Apple received fixed chipsets ahead of any other OEM.
In other words, they had no need to connect the superdrive to a 6Gbps port and it would have probably needed a motherboard revision to change the port in use, as it's unlikely to be just a firmware change.
e.g.
https://forums.macrumors.com/threads/1104245/
https://forums.macrumors.com/threads/1108989/
https://forums.macrumors.com/threads/1108201/
And the review
http://www.anandtech.com/show/4205/the-macbook-pro-review-13-and-15-inch-2011-brings-sandy-bridge/5