This has been an issue for a while now. I would say that the expert that they site is a little out of date however. In my job I'm responsible for TeraBytes of data that needs to be retained offsite for years. While Tape is cheap and has a long life span it has problems. One the drives to read the tape get out moded quickly meaning that the tapes from 5 years ago don't fit the drives we use today. Not to mention the software it not compatible either. Also while tape itself lasts, the tape cartridge can have problems if you don't put it in a drive and retension it periodically.
We now use verbatim Datalifeplus optical disks which like may brands are putting additives in their dyes that reduce the fade that older CD-R's and DVD-R had. You can also switch to more expensive CD-RW or DVD-RW witch use a different technology that write once disks and are good for up to 25 years.