Yup, noticed this too. I think many online publications have lost the concept of quality editing. They just want to rush content out to get hits. Sad.
And for them to use the words twice in the article... clearly the author doesn't understand what "rigid" means, unless it means something other than what we all think it does?
Maybe Apple has invented something new??? haha
I did not make up the term "rigid flexible." It's what this particular PCB is called. It's an "RFPCB," or "rigid flexible printed circuit board." As someone already explained, it's a PCB that uses both flexible and rigid technologies for better space management.