Look, Will, everyone's entitled to try and make a living, but honesty and authenticity are important, and you are mucking about in the gray area of the Terms of Service.
You are a paid copywriter, you admit you have no scientific credentials, and you are taking money from a nutritional supplement company to try and discredit the veracity of the FDA and vaccine makers (your client's competition) by presenting cherry-picked and carefully massaged information as "the truth". That's what your HPV articles are about. You do not disclose this openly on your "blog". That's unethical. Fortunately, your "blog" links back to your professional site, where you list your clients.
It was amusing that you tried also to discredit another blogger who challenged your information by labeling her an agent of Planned Parenthood, another entity in opposition to your client's claims. You were suggesting her failure to disclose that negated the value of her position. What do you think your failure to say "Look, I work for these guys" says about the value of YOUR claims?
Most of us here are doing this for free, and the only things we are promoting are our own opinions, and creative writing. When advocating for a service or product, it's best to be above board about why your opinion is or is not qualified, and what your motives are for writing them.