I was that guy in a similar discussion about music being useful for memory: “Why music causes memories to flood back”.
The marketing of the brain trainer and the music therapy are surprisingly similar.
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Music/(brain trainer puzzles) stimulate(s) multiple brain areas and that sounds like a good thing, so with some rhetorical magic we can link that to anything we want.
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Diseases such as dementia and Alzheimer will always grab the attention of the reader. You don’t even have to make any specific claims about the relationship between whatever it is you are selling and these diseases as long as you include them in the marketing text in a way that suggests some kind of related positive effect of the product.
In the music discussion I did get some reactions, although in my view no one was willing to debate the actual arguments I presented. In many other discussions being “that guy” as you put it has caused the discussion to just stop completely. I am curious to see if and how this discussion will evolve.