According the the FDA, in March of 2020 long before the existence of vaccines and vaccine obsession, warnings were adopted to include vascular compromise, arterial occlusion, stroke and blood clot.
This does not fit the timeline that you have proffered. It took exactly 14 seconds to find this rule change that was discussed long before March 2020, and ergo long before the advent of CoVID vaccination.
The vaccines were ready and executive ordered Sept 2019. First called Project lightspeed by BioNTech, following an U.S led pandemic exersize that ran from Feb 2019-Aug 2019.