The term "M1911" is a fairly new term, coined by the internet usage, and applies to any .45 Auto pistol that any way resembles the Colt Government Model Pistol. As pointed out, most just said "Forty-five" and the commercial was the "Government Model" which was Colt's trade name for the pistol, regardless of caliber.
But the term "M1911" continues in use even though the pistol looks more like a M1911A1 or even a Gold Cup. In old movie usage it was "Forty-Five Automatic."
The times, they do change.