Zero coupon bonds exist, they work by being sold at a discount eg just making this up, a $1000 bond might be sold at $950 for 1 year term. So you pay $950 now and get $1000 in a year.
What's claimed not to exist is a Zero Coupon Perpetual Bond. A bond that never matures and pays no interest.
Of course then the article claims crypto is this type of bond. It's a mathy financial jargon gimmick argument.
A modern printed dollar note perhaps does this. The perpetual part requires the government to not cancel the note, which occurred in India and Europe in past couple decades.