They sell real Kosher Food at Yankee, Mets and Football games. (Mets and Football under Vaad of Queens, Yankees I am not sure since I am not a yankee fan)
(Madison Square garden refused to get a Kosher vendor)
They usually have minyanim at or near the Kosher stands and you always see people with kipot at the events (especially Baseball Games) , Most of them are more modern types, I dont see as many “black hatters” at the game.
If you think its Bitul Torah you will never approve.
Obviously the Vaad of Queens would not give Hasghcha unless their Rabbis Approved of it