I am extremely critical of any theory pertaining to Oak Island, especially anything pertaining to the Templars. Conversely, it is unrealistic to believe the entire thing is a hoax. SOMETHING happened on the island, and it is reasonable to suspect it was a depository of some kind.
That said, if you read my original post again, you will see I did not provide a theory about who, what, or when. Instead, the construction of the system I described is based on tangible evidence located on the island. Granted, this is based on the presumption the Lagina's were honest about the carbon dating of the slipway, as well as honest about the items they found in the "Money Pit".
Or plainly stated, just because many people buy into a false narrative, that does not mean the entire thing is a hoax.