"Economists have correctly predicted 9 of the last 5 recessions."
https://www.bloomberg.com/news/articles/2019-03-28/economist...
More like, predictably bad in a wisdom-of-the-crowd way that could actually result in a good prediction: https://www.bloomberg.com/opinion/articles/2019-07-19/recess...
Not if you're an economist. We have some standard indicators to gauge economic growth, and those years you mentioned looked fine according to most indicators.
The "economists don't know what they're doing" trope is overused. Economists are always wrong, but they still have a track record of being less wrong than everyone else.