The funny thing is how the word for the newly produced items imitating older styles has come to mean "older" when speaking of games.

If we look at the description for retro it's original meaning is something new imitating an older style:

Compare to the word vintage that means old:

I see the word retro used for "old" spread outside of gaming nowadays too, I wonder what we will use to describe a new production imitating an older style in the future. :)