That book recycles moldy old antivax tropes revived for the pandemic.

Recommended instead: Vaccines and Your Child: Separating Fact from Fiction — co-authored by Charlotte A. Moser , and Vaccines: What Everyone Needs To Know by Kristen Feemster. The authors rely on evidence and don't hide behind "Anonymous", like your turtle friend.

Instead of pulling into one's shell so that facts bounce off, try reading those books. Don't be duped by tech multi-multi millionaires who deal in ludicrous conspiracy theories while milking "thousands of _paid_ subscribers".