what does this mean in the instructions?

NOTE:
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the step which adds the warn sign in the warned posts, and the notes table, are a bit different in the postbit_legacy template. So please do not apply the change shown above. In the postbit_legacy template, please find:

@ line 1463 u have this info and i just dont understand what it means....when it says dont apply the changes shown above...why does it say that? just confusing me...please explain thanks.

[sv1cec]

Up until that point, any change you made in the postbit template, could be applied in the postbit_legacy template as well. For this change, the modification is not the same, so it just warns you to pay attention that the code is different.