That 250,000 figure is just for 2021. From Steve Kirsch at kirsch.substack.com:
After a 7 month review by his university, Mark Skidmore, was exonerated of all charges and his new, improved paper was published in a more credible peer-reviewed journal.

Michigan State University Professor Mark Skidmore was exonerated of all ethics charges after a 7-month investigation. His paper was revised and was reinstated in the peer-reviewed literature. It revealed that over 250,000 people were killed by the COVID vaccine. Others have found similar numbers.
Executive summary
Mark Skidmore wrote a paper that showed that 217,000 Americans were killed in 2021 by the COVID vaccine.
The journal retracted the article and Mark’s university commenced a 7-month investigation into unethical behavior by Professor Skidmore.
Today, I’m pleased to announce that Professor Skidmore has been exonerated on all charges and his paper, with some helpful additions suggested by Dr. Susan Oliver (and her dog, Cindy), has now been published in another peer-reviewed journal.
The news on the investigation and the paper
See this press release that Mark sent me.
The press release was drafted by the Liberty Counsel who was instrumental in defending Mark in the investigation by Michigan State University. If you want to support their work, please donate here.
Bottom line: After a 7-month ethics investigation, Michigan State University found that Mark did nothing wrong!
Note: What this really means is that they tried for 7 months to find something they could nail him on, and they failed.