That is not correct, this patch is meant to prevent block break desync, which is when your client and the server disagree about what blocks are placed in the world. If the server discards/ignores anything your client sends, the server MUST reply telling the client to undo that action, otherwise desync occurs. (e.g. "i have broken this block" -> the client is too far to reach that block -> the server has to reply with "set that block back to air").

The original version of this patch https://github.com/PaperMC/Paper/blob/d934dcc1e3e8b1ac34acef... fixed that desync, but it allowed you to force the server to generate an unlimited amount of chunks, which is an expensive operation.

You could only find players using this patch after it was modified to only reply if the chunk was already loaded. But at no point in time was this patch able to reveal if a chunk had been previously generated or not, that is a separate unrelated issue in which Spigot will reliably send a partial chunk on initial generation, but never for a previously generated chunk.

Take a look at https://2b2t.miraheze.org/wiki/Nocom