One way to rephrase your statement is “Suppose we lived in a universe where when you combine two peanuts with another two peanuts, you don’t get four peanuts”.
The intended meaning of that sentence was that adding two of one thing to two of another thing does not give consistent results, regardless of the things you’re adding. Adding two peanuts to two peanuts does not consistently result in any particular quantity of peanuts, and the same is true of any other objects you might attempt to add together.
If the universe you describe is somewhat predictable
For the sake of an argument, we shall suppose that it’s not. It’s nigh-impossible to even make sense of the hypothetical as proposed, but then, if there were alternate realities where math could exist or not exist, they would probably be mutually nonsensical.
The intended meaning of that sentence was that adding two of one thing to two of another thing does not give consistent results, regardless of the things you’re adding. Adding two peanuts to two peanuts does not consistently result in any particular quantity of peanuts, and the same is true of any other objects you might attempt to add together.
For the sake of an argument, we shall suppose that it’s not. It’s nigh-impossible to even make sense of the hypothetical as proposed, but then, if there were alternate realities where math could exist or not exist, they would probably be mutually nonsensical.