The mRNA vaccines have not been shown to elevate clot risk.
This risk was only seen in adenovirus based vaccines.
The AstraZeneca vaccine, like the US Johnson & Johnson vaccine, was made by inserting a DNA copy of the spike gene into an adenovirus. This adenovirus cannot cause disease since some of its pathogenicity genes have been removed.
Among the general population, there is a small risk of developing blood clots, about 1 per thousand. Clots are caused by a number of different factors: disease, drugs, injury, sitting too long, etc. The J&J adenovirus based vaccine was documented to increase the risk of blood clots by about 4 cases per million. The AstraZeneca vaccine was also associated with this slightly elevated risk of clots.
For context, around a third of hospitalized Covid patients develop blood clots. For this reason, anticoagulants are routinely given to these patients.
Partly because of the slight increased risk of blood clot, the J&J company requested the FDA to rescind approval of its Covid vaccine. The J&J vaccine is no longer manufactured or available.
It appears that the clot risk was due to an immune response against an adenovirus protein. (No reference for this; this is my educated conclusion based on the facts.)
https://www.cdc.gov/coronavirus/2019-ncov/vaccines/safety/adverse-events.html
https://www.cdc.gov/coronavirus/2019-ncov/vaccines/safety/safety-of-vaccines.html
https://www.yalemedicine.org/news/coronavirus-vaccine-blood-clots
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2020806/
My daughter’s father-in-law died of blood clots in both legs right after the shot. All those agencies you had in your links can’t be trusted.