Minor discrepancies (and there is no other word for those differences except minor) are a sign that they actually take their own measurements, which is an added value. Comparing those measurements to the manufacturer's website doesn't mean that A.G. Russel is wrong either - make a video of you taking measurements from the actual knives if you want to say they're wrong. It could also be a case of small design updates. If this was over an inch in blade length or 1.5x the weight, it might be a little more of a problem. I actually have gotten paid to write across several genres, always for well respected sources, and in the instances of product reviews I would NEVER take measurements from a sales website or a manufacturer's website. The whole idea of a third party review is gathering data points that are not influenced by others, and presenting first hand data.
However, it is disturbing that A.G. Russel did not reply to your inquiries, even if it's just a small discrepancy. Like it or not, they are in the publishing business when they publish a website, and presenting accurate information should be of the highest importance. They don't even have to change their measurements, but they should address any serious concerns about the accuracy of their website. Nobody has any reason to doubt your story, but the difference in the measurements that lead to your boycott does seem very suspicious (like the guy that wanted to boycott Emerson because the wave was catching on his jeans). You're probably just a neurotic person that has somehow gotten into the position of reviewing knives, and do not understand that your concerns are not that big of a deal to people that would actually read such a review. Or A.G. Russel slighted you in some other way and you've been looking for something to hold over their head for a while, and this is the bet you could come up with? Seriously, this industry is polluted with hundreds of terrible websites (even the best websites are loaded with out of stock items and glitches, poor navigation and a lack of pertinent content + features), mediocre marketing representatives, old huffy people that do not understand the Internet abound, and customers that are as every bit as hard to please and neurotic as you are - if this is the worst you can find on A.G. Russel, I would probably vote for him for President. Seriously, this is more of a vote of confidence than an indictment.