RSI is one of those things (ADHD, autism and dyslexia are other examples) that start as a label some scientist puts on a specific set of symptoms that cannot (currently) be linked to a specific condition [1], becomes popular and then get used for a zillion things with more or less the same symptoms (Wikipedia lists edema, tendinosis, tendinitis, carpal tunnel syndrome, cubital tunnel syndrome, De Quervain syndrome, t…
“RSI” from typing too much in an uncomfortable way or using bad equipment is too serious to brush off. For anyone reading here, if you’re regularly feeling any level of pain while typing, take an immediate break to figure out what’s wrong. If you let it persist it can do you serious damage. There are a number of ways you can relieve your symptoms. Scale back your typing and keep trying ideas until the pain goes away.…
The article wasn't brushing off RSI, just pointing out that none of those things worked for him, and that emotional stress and cold seemed to be the major factors.
I certainly agree that you should look into ergonomics, but additionally you should definitely consider emotional stress, as there is ample evidence that stress may be a significant factor in many types of chronic pain.