The linked "click bait" article explains this very clearly as well. It clearly explains the methodology: they took the prompt sent to an LLM by a popular open source carb counting iOS app and sent it, together with five different pictures of food that a typical person might take, to all of the frontier models, and checked the responses. They also explain the purpose: to check the possible accuracy of this approach taken by a real app that real people use.

The fact that you somehow perceived this as an attack on LLMs as a technology is a failure entirely on your part. There is nothing in the article that suggests that people shouldn't use LLMs for other purposes - just a statistical verification of the fact that they shouldn't be used for this one particular thing.