Uh... I don't remember it being called "macaroni pie" ("Jamaican" or "Caribbean" or otherwise), but speaking as a white dude, I have absolutely eaten solid bricks of almost crunchy macaroni before. And yeah, it was pretty good, I guess, but I don't know that I would say it was better or worse than what Woolie is calling merely "baked macaroni" or "macaroni casserole," as if those things are fundamentally different in some way... which I suppose they are, because, indeed, they tend not to be solid, almost crunchy bricks... but it's still just mac and cheese, dude. I mean, it was certainly better than the Easy Mac shit you just get out of a store-bought Kraft box or whatever (assuming you don't doctor that shit up to not just be what comes out of the box, anyway), but it wasn't some life-changing miracle like what Woolie is making it out to be, either.
Or maybe the "macaroni pie" that I had was just some substandard variant (or possibly just grossly overcooked "baked macaroni" or whatever), and it's possible I've never had the 真 Macaroni Pie of their childhoods before. And, of course, I've also had regular-ass "baked macaroni"/"macaroni casserole" as well, and yeah, that stuff basically just breaks up into slightly better than standard macaroni and cheese, rather than retaining its carved-out shape.
In any case, the cheese is what makes or breaks macaroni. I've had absolute dogwater macaroni before, because the cheese used with it was a disgusting, curdled, (dog)watery mess. I'd rather have had whatever cheese-like goop they sell with Easy Mac than that, to be honest, and even that shit is not great, either.
In any case, it sounds kind of like the Rice Krispie Treats version of macaroni and cheese, compared to, like, just eating a bowl of Rice Krispies or whatever.