The post doesn't claim that AI is useless. It just makes the point that sometimes there are much simpler (faster, cheaper) solutions that are just as effective if not more so.
Sure these are often things AI is capable of doing. However, if using AI provides a worse product, building it takes longer and costs more, and the product is error prone, slower, and or more expensive to use then AI is simply a poor solution. The only argument has nothing to do with the product it’s about padding a resume etc.