In case anyone was curious, here are the numbers from the provided link around a couple of the time periods indicated:
> 1960Q2-1960Q3 - GDP grew, yet this is flagged as a recession.
1960-01-01: 542.648
1960-04-01: 541.08
1960-07-01: 545.604
1960-10-01: 540.197
1961-01-01: 545.018
> 2020Q1-2020Q1 - This is flagged as recession, despite being less than a single quarter. By "two consecutive quarters definition, this recession started in 2019Q4 and lasted until 2021Q1.
2019-10-01: 21694.458
2020-01-01: 21481.367
2020-04-01: 19477.444
2020-07-01: 21138.574
2020-10-01: 21477.597
2021-01-01: 22038.226