Why very noisy uncrewed submarines make weak decoys

Could uncrewed underwater vehicles imitate very noisy older submarines and distract anti-submarine forces from quieter boats?

They could draw attention, but conspicuous noise would make them easy to find and destroy.

Making an uncrewed vehicle conspicuously noisy could draw attention away from a quieter submarine. The immediate drawback is that a loud contact would be easy to detect and destroy. The idea is treated as an option, but the decoy is expected to be disposed of quickly.