They don't pay interest, but they accrue value toward their principal amount. Any time prior to redemption, you can refer to the amount that has accrued thus far as 'accrued interest', or 'accretion value'. It's also not really industry standard to call the final date the 'maturity date'. It's usually called the 'redemption date'. I think referring to the maturity date in the article is an attempt to avoid confusing readers with too much dissimilar jargon, and it's not technically incorrect. I'm changing the article to say "The bond holder receives the full principal amount as well as value that has accrued on the redemption date." If you prefer a different phrasing, please have at it.
Redemption/Maturity date are interchangeable though' "maturity date" is far more widely used. Note that you should never use the phrase "accrued interest" in the context of a zero coupon bond, there are subtle but important (to a bond trader anyway!) differences in considering a zero-coupon as a "zero coupon bond" or as a "single coupon paid at maturity" bond. The theoretical price of a zero-coupon bond is the net present value of its redemption amount, there is no such concept of the "value that has accrued".
Zero coupons
