Almost by definition it is not. If you are "gaming" a specific benchmark, what you have is not progress in general intelligence. The entire premise of the ARC-AGI challenge was that general problem solving would be required. As noted by the GP, one of the top contenders is BARC which performs well by generating a huge amount of training data for this particular problem. That's not general intelligence, that's gaming.

There is no reason to believe that technique would not work for any particular problem. After all, this problem was the best attempt the (very intelligent) challenge designers could come up with, as evidenced by putting $1m on the line.