It absolutely was. I think I’m in a somewhat unique position to comment on this: Me, my wife, and my two kids were ALL in the Pfizer clinical trial (adults first, fall 2020, kids in 2021), and then we were active in setting up vaccine clinics and connecting people with vaccine appointments once they were available (my wife in particular - it was basically a second full time job for a few months). Let me tell you, the disclosures to people in the trial were, as you would expect, A LOT, and the information given out at clinics was at least as robust as with other vaccines. Probably more, based on my experiences getting flu vaccines and such.
To say the risks (which were documented to be lower than other types of vaccines) were not disclosed is either tremendously ignorant or tremendously dishonest.