From the article it seems to be write once and then it is read only. As reading requires mechanical movement (for now), I would guess that random reads are quite slow.
So I guess the first application would be archives, and then later it could be used like a CD.
Which would beat current LTO tape, that’s the real goal they have. It’s not replacing hard drives, random read time isn’t important, it’s archive. Tape can be real finicky to store at volume, but it’s amazing at archiving. A single tape can now natively hold well over 20TB and doesn’t need to be kept powered on.