You can tell people whatever you want and they can criticize you accordingly.

If you don’t disclose your affiliation with a company that you’re shilling, rational people will criticize you for being biased and self-serving.

If you want to avoid this completely rational, acceptable, and expected criticism, then you should reveal any conflicts of interest before or during your promotion of the business.

This shouldn’t need to be spelled out for you, but this generation has been conditioned to be proud of ignorance and defending abuse.