Earlier quoted context omitted.
Cuomo literally harrased his own highly competent NYC Transit director into resigning, for disagreements and stealing the spotlight. The LGA airtrain is an expensive boondoggle that is thankfully looking like it will be canceled. He was into large statement projects he could slap his name on regardless of actual need because he was clearly a huge narcissist.
Why LGA airtrain would be a boondoggle? AFAIR, right now there's no way of getting to LGA without risking being stuck in the traffic for an hour.
By contrast, the LGA Airtrain idea is to go the wrong way. This extra detour means that existing transit (i.e. buses) is likely to still be a faster way to get to the airport. It also requires a separate transfer, with a separate, steep (IIRC) fare for what it's doing.