Turns out it was the semicolons at the end of the lines the if statements were in. This took make me way longer to realize than it should've. :/

main.cpp

@@ -197,9 +197,9 @@ int	main(int argc, char **argv)
     cellular.SetNoiseType(FastNoiseLite::NoiseType_Cellular);
     cellular.SetFrequency(.1F);
 
-    for(int bx = 0; bx < 16; bx++)
+    for(int bx = 0; bx < 1; bx++)
     {
-        for(int bz = 0; bz < 16; bz++)
+        for(int bz = 0; bz < 1; bz++)
         {
             for(int x = 0; x < 16; x++)
             {
@@ -216,7 +216,7 @@ int	main(int argc, char **argv)
         }
     }
 
-
+    printf("\n0, 2, 0: %i", blockManager.isAir(0, 1, 0));
 
 
 /*