He is technically and legally correct. NY State law doesn’t require that an indictment set forth the “other” crime or crimes. That isn’t an element that has to be independently proved.
Sort of. But not always. For instance, if an indictment charges a crime of burglary in NY. That means that a person illegally enters or remains in a building (say a home) “with the intent to commit a crime therein.” But the prosecution doesn’t have to specify what that intended crime might be. It could be theft. It could be rape. It could be assault. Whatever.
The prosecutor has to somehow prove that the defendant had such an intent but doesn’t have to prove that beyond a reasonable doubt.