This potential ban is about preventing lithium batteries in "checked" luggage, it is not about hand baggage. Read the article again. The FAA has been concerned for some time that lithium batteries should not be stowed in the holds beneath the main cabin floor, they believe laptops, hence those batteries, to be safer in the cabin. DHS reversed their earlier decision last summer. That is past history.
Two different agencies here with two separate areas of safety concern.
July 20th 2017---"The United States has ended the ban on large electronics in the cabins of airlines that it announced in March."
"The DHS had banned electronic devices larger than a smartphone in the cabins of airplanes on direct flights to the U.S. from 10 airports in the Middle East and North Africa. The ban affected airports in eight countries: Saudi Arabia, Qatar, Kuwait, United Arab Emirates, Turkey, Jordan, Egypt and Morocco.
King Khalid International Airport in Riyadh, Saudi Arabia, was the last airport to be taken off the Department of Homeland Security's ban list, which originally affected 10 airports and nine airlines, mostly Middle Eastern carriers."Http://www.npr.org/sections/thetwo-way/2017/07/20/538289182/u-s-ends-laptop-ban-on-flights-from-middle-east