Those refreshes are all aesthetic such as a new 'slim' version and don't improve performance. The PS4 and Xbox One refreshes actually had a faster CPU and GPU. I don't recall a console getting upgrades before that. Quite the opposite because the Mega Drive refresh was considered a downgrade due to removal of the headphone jack.
You same as what i was thinking, just a different design that came out occasionally. Nothing remotely like this bs which is basically making the point of a console redundant if you can buy an upgraded version 2 years after buying the original.