OK that answers nothing at all.
Yes, it does.
That's the support I'm going to get after spending hundreds of dollars on your sceneries pointed to a thread that is not something that I am experiencing?
You have been referred to the correct thread. Read it more carefully: the poster discussed TWO issue. The reply you wanted was in the 2nd one, I'll highlight it for you:
This was your request:
I want to know how to fix the problem of ai getting no t\o clearance after position and hold.
This is what was discussed in the other thread:
The other thing is I'm ok to position and hold but never cleared to take off, As soon as I get airborne, tower tells me I'm not cleared for take off.
As you can see, it's exactly the same issue. And yes, the default ATC has the same problem, regardless if the airplane involved is an AI airplane or your own airplane.
You are asking how to "fix" this. If you read my reply, you would understood is just how FSX ATC works and, one way or the other, we would have to compromise the scenery accuracy (the visual scenery won't match the AFCAD anymore if we did, so it will still look "wrong"), if we tried to fix this by moving the hold zone in a different (not real) place.
I'll copy the fully reply again here:
That might due to the issue of hold short zones being too far from the runway. Of course, we placed it in the correct place, but that doesn't mean the correct place is handed correctly by FSX. But if we placed it in the "wrong" place, in order to appease FSX, the logical position of the hold short zone won't match the visual position of the (custom) textures which are of course in the correct place, so people would immediately complain that the hold short is wrong, either because ATC won't clear them in the proper place, or because AI would hold short in the wrong position. And if we moved the visual hold short zones in the "wrong" place, to make the FSX ATC happy, people will rightly complain the scenery is not accurate to real world...