Wiki: Originally, 32 ships were planned, with $9.6 billion research and development costs spread across the class. As costs overran estimates, the quantity was reduced to 24, then to 7, and finally to 3, significantly increasing the cost per ship to $4.24 billion (excluding R&D costs)[1][18][19][2] and well exceeding the per-unit cost of a nuclear-powered Virginia-class submarine ($2.688 billion).[20][21] The dramatic per-unit cost increases eventually triggered a Nunn–McCurdy Amendment breach and cancellation of further production.[22][23] In April 2016, the total program cost was $22.5 billion, with an average cost of $7.5 billion per ship.[2]
https://en.wikipedia.org/wiki/Zumwalt-class_destroyerDollar cost averaging...it's why the B2 bomber is "worth" $2B +...
Not going to defend the program, reads like it was a normal, complete, USN fustercluck...but not a fan of intentionally misleading hype either. If the 32 ships had been built at "cost", then the ammo cost would have been way down as well.