No proof.
Seems to be a popular opinion around here though.
Lost my father in law before the vax was available.
I have friends who've lost parents and siblings to it, almost all of them had some sort of comorbidity whether a heart issue, lung issue, recovering from cancer, etc.. I honestly cannot say if the China virus is what killed them or just "pushed them over the edge" to death. I'm no doctor.
On the other end of the spectrum, I know people with comorbidities that survived it just fine. There seems to be no logic or reason to it.
Finally I also know people who were perfectly healthy, caught it and had "long covid" for quite some time. Two people I know still don't have their sense of smell or taste back after catching it in 2020.
Bottom line is: who the hell knows? All the lies and deception around the virus, vaccines, and more coming from our Government and three-letter-agencies make it impossible to know for certain. And that's probably exactly what they intended.
Bastards.