The way I choose to interpret it is that a single story cannot become a series or a number of episodes. You can't have 12 episodes to tell your tale. It does not address characters returning.
How do you make reference to backstory of a character without creating a continuity between episodes that could be seen as a series? What story fabric makes a series? I see you are viewing a "series" as one story spanning multiple 30 mins. But TOS had different stories and was a "series".
This would be a good question for the CBS rep, or not, depending on whether one wants a ruling now or later. I'd personally go for later.. I hope your view is the one that aligns with theirs.