Been a lot of claims during this pandemic that have been proven to be ********. Yes there are short term reactions to the vaccine affecting a tiny percentage, like 0.01% or less. Whereas long covid affects some 10-20% of those that got covid infections. If Didi had some type of medical complication its far more likely to be due to something other than the vaccine, including something completely unrelated to covid.
Here's something on his medical issues: https://www.timesherald.com/2021/07/03/phillies-notebook-strange-sounding-elbow-ailment-very-real-for-didi-gregorius/