The distillery wasn't founded in 1608. It is not the oldest in the world. In that respect it is a phoney.
As Jim Murray has written, in his usual forthright style, ""the Bushmills Old Distillery Co was not formed until 175 years later."
There are those who believe it wasn't even founded in 1784. Charles Craig could find no evidence of a distillery on the site prior to 1833.
Jim Murray points out (Classic Irish Whiskey, p55) that Middleton Distillery has exactly the same right to claim a 1608 foundation date. In other words, a spurious one.
I'm boycotting the stuff, until Diageo stops telling fibs.
(Yes, I appreciate that last statement will have the world's biggest booze company quaking in its boots

