That oil residue is caused by boost pushing past the rings and forcing air into your intake. Now, a little bit of oil is fine. I'm talking a little weeeeeee bit over a substantial period of time. Theoretically, if this was the first time your car was ever checked for that leaky oil issue, I'd say that's not a big deal. Have another look 5K KMs from now to see what its like.
You may have just sealed up a boost leak with your investigation tho
If oil was dripping out of the inlet and down the motor mount, a proper seal wasn't formed at the inlet.
Close! I believe he means the little black nipple on the turbo inlet that he snapped off; happens to quite a few people. The nipple on the EBCS is pretty much indestructible to tugging and needle nose pliers.
You are right tho, the nipple on the tip needs to be sealed to keep fuel targets in order.