From the election Wikis:
2020 - Biden 81,283,501 Trump 74,223,975
Total - 155,507,476
2024 - Trump 77,303,573 Harris 75,019,257
Total - 152,322,830
The numbers for 2020 were artifically inflated due to increased vote by mail usage due to the pandemic.
From that inflated number, the overall count was down 3 million, but Harris only dropped 6 million from Biden’s numbers, not 18.
Substack blogs are not news.