Is my tweeter shot?

Hi all. New here with a recent purchase of a Monitor 10. I think it is the original Monitor 10 with the non peerless tweeter. My tweeter from reading some materials here are the SL2500? Anyways, recently my left speaker sounded really muffled. The tweeter although dented, sounded fine until just recently. I'm not sure what that squirly thing is to the side, but noticed it came off recently. Would that have killed my tweeter or did it just went bad?

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