that they are considered vintage. The iPhone 6s initially launched in 2015, but Apple kept it around as a low-cost device until 2018, which is why it is only now being added to the vintage list. The iPhone 6s had Apple's A9 chip, and it was equipped with a strengthened aluminum chassis to fix the iPhone 6 "bendgate" design flaw.
It was also the first iPhone with 3D Touch,...
Juli Clover.
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Apple Says These Products Are Now Vintage

Apple today updated its vintage products list to add the 2018 Mac mini and the iPhone 6s, devices that will get more limited service and repairs now... - www.macrumors.com