The document attempts to illustrate economic cycles/financial panics over several decades.
The fact that 2019 comes just before Covid (2020) is indeed unsettling, but we need to remember that this kind of pattern is often reconstructed in hindsight and remains highly interpretive. That said, several dates mentioned do correspond to significant crashes, booms, or economic turning points.
Here are the major events tied to the dates in the document (with a ±2 year tolerance as requested):