I don't think you understand exactly what 'digital' means, however, I shall tell you:
Most likely, if the Internet wasn't alive, then it's not a digital currency. Thank you.
whilst you are correct that the definition (which could be amended) includes that it is electronically created
a) it was clearly a currency for many centuries
b) Obviously it was digital
digital (ˈdɪdʒ ɪ tl)
adj.
1. of, pertaining to, or resembling a digit or finger.
2. manipulated with a finger: a digital switch.
3. having digits or digitlike parts.
4. of, pertaining to, or using data in the form of numerical digits: a digital recording.
5. displaying a readout in numerical digits rather than by a pointer or hands on a dial: a digital clock.
6. Computers. involving or using numerical digits expressed in a scale of notation to represent discretely all variables occurring in a problem.
7. of, pertaining to, or using numerical calculations.
8. available in electronic form; readable and manipulable by computer.
n.
9. one of the keys or finger levers of keyboard instruments.
10. a digital device, as a clock or watch. c) it was virtual
d) it was a medium of exchange
So we could consider the tally stick a digital currency pre dating electricity/internet
http://en.wikipedia.org/wiki/Digital_currencyApart from the "electronically created" part of the def. which was not an option in 1100A.D. it fullfills the virtual and medium of exchange aspects which are arguably the more important part.
http://en.wikipedia.org/wiki/Medium_of_exchangeDigital currency is a form of virtual currency or medium of exchangeand its aims and effect, to remove power and abuse from money changers/bankers is consistent with the aims of todays virtual and crypto currency

additionally the conclusions of the author in the 2006 book may well be altered with the rise of cryptos since 2009
clearly digital to me as well.