He may be referring to the last “all-aluminum” 747 ... the carbon-fiber version (747-8) appears to remain in production.
https://en.wikipedia.org/wiki/Boeing_747-8
The 747-8I (passenger) and 747-8F (freighter) versions are still technically in production, but are currently being produced at a rate of 1/2 of an aircraft per month. At that snail's pace, Boeing will exhaust it's backlog of orders in 2019.
One of the last 747-8s to roll off the assembly line, if not the very last, will be replacement aircraft for Air Force One.
They are definitely not stopping 747s entirely. Other aircraft like the 787 don’t fit in the same market niche. The niches are determined by the ratio of range to capacity. Boeing needs to have an offering across the range of markets or they will lose out to Airbus.
The confusions here probably comes from the composite version not being built on the same manufacturing line. It needs different tooling.