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Originally Posted by Tmarkwald

Never Been Done Before?

mRNA vaccines have been tested in humans before, for at least four infectious diseases: rabies, influenza, cytomegalovirus, and Zika.

Want to Know More About mRNA Before Your COVID Jab? | MedPage Today.

The History of the mRNA Vaccines – The History of Vaccines

They have experimented with mRNA vaccines for 20 years.
This is quote is directly from the link you provided:
“The extra boost from the urgency of the pandemic and the government funding they received allowed them to conduct large-scale clinical trials at almost the same time that they were tweaking their formulations. By the time Moderna and Pfizer submitted their data to the Food and Drug Administration for Emergency Use Authorization, about 30,000 people in the Moderna trial (including my wife) and over 43,000 in the Pfizer trial had received the vaccine.”
That’s it. There have been no long term trials. The FACT is that NO ONE knows if there will be any long term side effects from the vaccine.