Is it?

I'm skeptical, as it seems to have that ring of circa-2003 WMD justification about it, but I won't dismiss it out of hat.

And if the US intends to prosecute Maduro on drug crimes in SDNYC (good!), then they'll have to present evidence to the court, which presumably means they think they have a case.

Personally, I doubt Maduro intentionally ran a narco-state as a primary focus. But I can very much see a sizable narcotics enterprise, with state support, being used as a key way for him to enrich select supporters absent a viable economy. Money to pay the generals has to come from somewhere...