Hey guys,
The thread you’re thinking of was mine on cloning my gym fob
@amal’s summary is correct, even a Proxmark can’t decode it and you’ve got basically no chance with any cloner you can get off the shelf. At least the most recent ones are a T5577 under the hood (not sure about older ones, may have been a custom chip)
If yours is a T5577 then a Proxmark can dump and restore it to a xEM or NExT, but theres no real way to tell this for sure without spending the money.
Good luck! Annoying little tags!