Pretty scary advice. FYI BX in Canada (AC-90) does have a copper bonding conductor included. In fact all armored cables here have integral bonding conductors. We did have AC-90 that had an aluminum ribbon in its construction but it has not been an approved cable since the 1970s. Some very old steel armored cables have no bonding conductor but nothing newer than 1980 would not have a copper or aluminum bonding conductor. Heck we even require a bonding conductor inside even short lengths of flex or liquid tite. No external bonding wires here.
