Secondly, why do you feel that it's more than that?
Thirdly, even 800 deaths would be quite little compared to Covid19.
As in, fine for years, AZ vaccine, into monthly hospital trips and complications, Then finally a fatal heart attack at around the 1.5 year mark after the vaccine (iirc).
The dead is ruled as heart complications, but they only ever shown up after the vaccine. So it's difficult to say that the vaccine killed her if it's technically the heart complications.
If she never got the vaccine she probably would have been fine, but then again she could've eaten something spicy and had another heart attack. Who knows
Generally impossible to pin down the cause for an individual, but a trend can be seen from looking at the whole population.
However any statistical analysis will have confounding variables (in this case, negative health effects of the virus itself, and the lockdowns etc.). Similarly with Chernobyl (the effects of the evacuations, and the general collapse of the Soviet Union around that time both had severe negative health effects). So basically any population level analysis of death rates etc. is always a bit dubious - how to tell one cause from another?
In the case of Chernobyl we already knew radioactive contamination is harmful (from previous experience). We know the AZ vaccine has certain potential complications (statistically). But it's impossible to pin down the cause for any given medical case.
I don't think this metaphor will hold up because both Covid infections and vaccines present an increased chance of myocarditis, the former at a higher rate.
Cause and effect for any disease is pretty hard to pin down because of the astronomical amount of variables.
Basically it's impossible to estimate.