They just agreed to a $131 million settlement. The article says this is a hundred times what they spent to prevent Mamdani from getting elected.
Presumably somebody who thinks the Mamdani’s policies will be popular and spread to other jurisdictions. After all, why campaign against an idea that you think will fail? It’d exist as a prominent warning flag for the next group that considers it.
How did you come to that conclusion? The very first sentence explicitly explains that to be false.