I think it’s sad the way you glibly mix fact & fantasy in your posts. Interestingly the incidence of post injection malignancies in cats is noted as being 1:10k to 1:1k. The veterinary literature has not caught up to you and is unaware that oxidative stress is the cause. In fact certain vaccinations are more likely than others to result in injection site neoplasms and the relationship is well established.
https://todaysveterinarypractice.com/oncology/feline-injection-site-sarcomas/
Have you read the articles that you linked? The TVP article you linked states, and I quote, "Tumors also occur secondary to injections of steroidal and nonsteroidal anti-inflammatory drugs, antibiotics, and lufenuron; microchip implantation; and inflammatory response to nonabsorbable surgical suture material."
Please read the article thoroughly. It is very clear about the fact that the sarcomas are related to the injection, not to the contents of the injection. Gee, even sutures cause the type of oxidative stress injury that (rarely) induces a sarcoma.