Most familiar to you is when a physician will say "It's rare", without mentioning rare could be 1/10 or 1/10000.
In this article, "long term" seems to be about 6 months on the longest term. (Not mentioned in this article, but I recall reading something similar).
So when politicians/physicians/me/you need to make difficult decisions we are given words like "common, rare, long term, and short term" that contain little meaning.
I'm just not sure why the medical industry does this when the data is available. I sure wish we could push back against this. It's irresponsible.