I think some people are missing the conflict of interest because the author blurs the lines between his personal opinion and his business. He turned his personal brand into his business and uses his name as his brand.
No, what's going on is that you don't understand what "conflict of interest" refers to.
Different people having different interests, as when the apple company says you should buy apples even though you prefer oranges, is just a regular conflict. A conflict of interest is when one person has two different interests. The apple company isn't experiencing a conflict in your example.
Pretty sure that's just marketing.
A lot of product pages will spell out features they have and list competitors that don't have those features.
It's even worse: that Nike has a conflict of interest because they think that wearing shoes while running is good, even though it would be extremely weird if a running shoe company thought that running with shoes is bad.
Remove the business from the equation and the opinion is fine — it's the existence of a business that aligns with the opinion that creates the conflict! Galaxy brain definition.
He has motivations that make him not impartial, but that's not usually termed a "conflict of interest."
You're just using the term strangely. Usually the phrase "conflict of interest" implies the person has some sort of official commitment / obligation / duty to another party that is put in jeopardy because of another conflicting interest.
But this is just some guy selling stuff. He hasn't made any official commitments; he doesn't have any official duty or obligation to remain impartial.
By your definition, anyone selling anything has a conflict of interest because they want money from their customers, which may be against the customers' best interests.