That's a good example of number abuse.
Normal coffee beans contain between 0.8 percent and 2.5 percent caffeine depending on origin and variety (source) so if they're talking about the beans then they are just normal beans.
If it's decaffeinated, I doubt that they could remove 99% of the caffeine - "Decaffeinated coffee is not entirely caffeine-free. In European Community (EC) countries, roasted decaffeinated coffee may contain a caffeine residue of 0.1 percent and coffee extract 0.3 percent." (same article as above).
This sort of use of figures is very common in advertising yet they're meaningless without context.
My favourite is:
Woman: How much did you save on the car insurance?