yeah in essence the guy was correct, technically boost from the charge pipe should push the piston up opening the dv but as standard it works a little different. not sure why it was like that
Richard from forge even told me this once cos i took my car in for work while the DV was reversed. but after a while the pinging sound got on my nerves so i swapped it back to the original way round
it wont cause no damage to the car though, its up to you