If you read the ATC transcript (in the original thread), it's pretty clear that the pilots knew they were at intersection T1 and would be conducting an intersection take off.
Except that in the mind of the captain (due to the setting for his own chart), that T1 intersection was costing him only at most 200 feet of the full length. Do we know how many times before that captain used rwy 09 for take off in MIA ... ?
The report mentions a few times they were using S taxiway - Is it really the case ... ?