Does anyone know ?

Actually all that they required by law was to cover it up or encase it and it could stay forever.
My office had a steam radiator in 1999 that had asbestos wrapped pipes feeding it.
The company merely had to encase the asbestos insulation and it was legal.
Also my home and the entire lane with dozens of homes was fed by a asbestos fiber water pipe.
And the house i bought in 1994 had asbestos wrapped furnace ducts and the floor tile contained asbestos
So asbestos is still around to this day.

Asbestos is ONLY dangerous during the removal process. So, unless you need to remove it, then don't worry.

Though rare, it is possible to have asbestos tested positive in Drywall. Though to be sure, you may want to run a second test with a testing company who has no investment in the outcome. 

At the same time, you will WANT to test the popcorn ceiling, and the drywall. 
When testing drywall, be sure to get a good sample which includes the seaming tape and mud. 

https://www.tri-techtesting.com/When-is-Abestos-in-Residential-Drywall-Regulated--.html

Well then, I guess you shouldnt bust it up and breath in the resulting dust.

Asbestos hasn't been used in 45-55 years. You might be getting conned.

dont be daft ...not drywall