He did emphasize, but it's a marker that does NOT automatically mean AF1.
BTW that computer on the Resolute desk is not really a laptop.
The IBM 5100 Portable Computer is a portable computer introduced in September 1975, six years before the IBM Personal Computer. It was the evolution of a prototype called the SCAMP that was developed at the IBM Palo Alto Scientific Center in 1973.
It was heavy and bulky and just barely portable. It ran the APL programming language. The first models had no mass storage.