Don't put that kind of faith into that. I have had professional cd-r's made by Taiyo Yuden and a couple other companies slowly go bad on me over the past few years. Disc burned mainly from 2002-2008. These were all stored in a temp controlled environment. Rather depressing considering how much I used to spend to buy long strategy disc. Ends up I am having them go bad more then the short strategy stuff I have had for the same amount of time.
Several recent (in the past few years) studies have shown that some CDRs will degrade in as little as a year. So much depends on not just the substrate, but the type of glue, protection of the top layer, and specific formulation of the plastic.
That said, Mitsui's Gold CDs have a VERY good reputation. There is no archival standard (yes, many archival mediums, like paper and microfilm, have ISO standards) for CDs or other digital media at this time, but I would say that Mitsui's Gold are probably more consistent in manufacturing quality than any other type of disc. And they are priced like it, too. They aren't making them for casual users.
So Prof is right that there are absolutely no guarantees at all, but Mitsui Gold is probably the safest gamble available.