Since 'RSI' may have many causes, it is unlikely a single treatment will help everybody. This article, in particular, looks like anecdata to me.
Having said that, the suggestions others give to sleep and exercise almost certainly can't hurt and if they may hurt you, you probably already know how fragile your body is.
Exercise breaks during work have the added benefit of introducing breaks. If I had to bet, those breaks are more important for RSI-like symptoms than the exercises themselves.
[1] A disease is a particular abnormal condition, a disorder of a structure or function, that affects part or all of an organism (https://en.wikipedia.org/wiki/Disease, via https://en.wikipedia.org/wiki/Condition#In_medicine)