Yes, that's all true and the use of the word cynical here is more nuanced. GP seemed to be impressed that a company was producing a quality product as an end in itself - providing consumer surplus for not necessarily any benefit to the company. A more cynical view is that they are doing that because it will produce a better outcome for them as well. Yes, it's a beautiful system and everyone wins, but, generally, altruism would be viewed as a higher motive than self-interest.

I can provide a different and less cynical interpretation for your example too. Companies that sell stuff that only lasts until the warranty is over are providing a valuable service for customers who don't want to pay as much as they would have to for a higher quality product which would outlast its warranty.