For metal head: No, Lahore ETO didn't require seller to be present. I took the car but they didn't see it. But the same probably doesn't apply with Pindi ETO cuz I heard they are asking for the seller as well giving the reason that they have not received any notification regarding extension of old method till 31st July. Strange....
For dasche: My info hasn't been uploaded as well. But I was told to expect updation after a month or two.
I would advise everyone to get their cars transferred tomorrow cuz after that its going to be next to impossible to get it done without the seller and would hence make it very difficult to sell your car if its not on your name.