*chuckle*
I would tend to argue that history vs. metaplot is a difference without distinction D.
Well, it's possible to treat it that way, but in practice, there can be a distinction.
For example, I was developing a line of SF gaming books for a game company for a game set a period of several decades in our future.
The specific directive from the publisher was: "This setting will cover xx years of future history from X until the point where the game is set. However, we specifically DO NOT want you to have a meta-plot. All supplements
and future adventures for the game will be set either an indeterminate time or at the fixed starting date established in the game setting as "present day."
That was written into the actual design documents for the game; the distinction was pretty clear, and applied strictly to all writers working on it.
It's possible to advance a timeline without having a meta-plot, though.
TAS news was indeed one of the earliest "meta-plot" elements in the industry. However, also by definition, meta-plot is something that has a significant effect on the setting as a whole - a big picture plot.
In the Imperium, while an ostensible date was advanced "in real time" and supported by JTAS's TAS news, this was basically a cute gimmick and a bit of color, not really a meta-plot... until it did start
to affect the big picture and change the setting.
It became meta-plot when it started building toward the Fifth Frontier War (and later the Rebellion)
Had TAS not introduced anything that changed the setting and focused on random interesting but never interconnected local news, it would not really have had a meta-plot, even if it continued to advance the timeline. If there is
no practical difference between 1105 and 1140, then there is no meta-plot...