A very good point that I was going to include in my comment on this article and left out in an effort to stay on my topic about the flaws of the calculation.

To support your point, I think it is more well known after this last year that "recession indicators" are lagging and we are typically in a recession a good 3-6 months before it is declared and the reverse is true for when we get out of it.

Thanks for bringing this up.