It's not. Just the same credibility. Unless a scientific method is used, the results are just talking points. I didn't go through their methodology so I don't know if the "inner circle" is representative of Apple watch owners.
They are looking at only the 20% that don't use Apple Pay for the more detailed "why they don't use it" data. In other words 5% of the 20% don't use Apple pay for security reasons. I believe that's 1% of the total pop.
If Apple watch is a failure and it allegedly has a majority of the market, what does it say about its competitors?
Of course Apple is always graded on a curve. Its sales being compared to a completely different product.