If I understand it correctly, the TSA is not forcing anyone to unlock devices. They take the devices away for some period, but if they’re securely locked, TSA won’t be able to get anything from them.
However, the article drops border searches which do require an unlock right into the middle of the article, then goes on to say that they have no specific examples of TSA doing the same thing. This implies that they have reason to believe it’s happening, but as far as I can see there’s no justification for that.
The big question is: what are they doing with these things? If it’s some fancy explosives sniffing (like they already do to my contact lens solution) then it’s nothing interesting. If it’s an electronic search if unsecured devices, that’s bad. If it’s an attempt to force travelers to unlock secured devices, that’s horrible. The article seems to want to portray it as the last one, while only giving evidence for one of the first two.