[toomuchtodo]

Agree that this study isn't rigorous, but the fertility rate decline has been stark for some time [1] [2] [3] [4].

[1] https://ourworldindata.org/fertility-rates/

[2] https://ifstudies.org/blog/number-2-in-2018-baby-bust-fertil... (Number 2 in 2018: Baby Bust—Fertility is Declining the Most Among Minority Women)

[3] https://www.bbc.com/news/health-53409521 (Fertility rate: 'Jaw-dropping' global crash in children being born)

[4] https://www.pewresearch.org/fact-tank/2019/05/22/u-s-fertili... (Pew Research: Is U.S. fertility at an all-time low? Two of three measures point to yes)