Where is the source for this? What is the source for the "long term decline" mentioned in the article?
The first sentence mentions the BLS, so I went there, and this is not what they say. https://www.bls.gov/data/#productivity
If you dont want to go through the various data, here are some articles with charts:
This one covers since the last recession: https://www.bls.gov/opub/btn/volume-6/below-trend-the-us-pro...
This one goes back further, but only up until 2012: https://www.bls.gov/opub/btn/volume-3/what-can-labor-product...