A Guardian review that dove deep into the science behind the headphones would be a worse review, in that it would be less useful to its target audience (who mostly don't know or care about that).
Maybe your objection isn't with such a review appearing in the Guardian but rather with it appearing on HackerNews. That's fair, however, to me, what is interesting about this post is that the Guardian (again, a widely-read, general interest newspaper) is reviewing the Fairbuds (a new product pushed by a fairly niche company focused on repairability and sustainability). And the review is largely positive. That is, the post is interesting as a reflection of social acceptance of this product and not as an exploration of the science behind the product.