The word is disingenuous.
You're right.
If I weren't selling it, then giving a testimonial on the product would be ok.
It wouldn't necessarily convince me, but it would certainly remove the conflict of interest.
Is this the case?
Yes. You may be a stand up guy (you seem to be), but again, I don't know who the F. you are, so you're gonna have to do better than your word as a gentleman to get me to shell out hard-earned money for the stuff.
What is it about the contents of the page that you find so objectionable? All it is is basically a list of the contents of the product. How does that lack objectivity?
I don't find it 'objectionable'. I find it 'questionable'. You have much more than just a simple list of contents. You have specific 'health benefits' associated with those contents. However, have those health benefits been associated with phytoplankton?
It may seem logical to say, 'Omega-3s are good for people. Phytoplankton has Omega-3s. Therefore, phytoplankton is good for people.' But that kind of reasoning, while seemingly sound, is fraught with with all types of errors. It may actually be true in this case. But then again, it may be entirely false.
Who knows what combination of minerals or other substances in the phytoplankton might render some of the possible beneficial substances inert? Maybe the combination of stuff might make it more potent than other sources. The point is you can't say one way or the other.
Until you cite a valid study and not the manufacturer's marketing info (again, they have a vested interest in people believing that the stuff will offer some benefit), then you can't say the stuff is any good. Frankly, if you think the maker's marketing info is a legitimate source for the stuff's benefits, then you're a lost cause.
To make matters worse, you can't really even say that the stuff is responsible for your own anecdotal results!! You could very well be experiencing a placebo effect yourself.