The Nokia platform would be that which we used to call Maemo in the past (currently Mer, behind Sailfish OS). Nokia no longer uses it.

No. Jolla is a bunch on ex- Nokia people who wanted to keep working on their then-current project.

Nokia allegedly started working on N1 when Microsoft deal went through.

I've heard the N1 is mostly Foxconn with some software (zlauncher) and industrial design from Nokia.

sounds like every apple product.

Well no. Foxconn only does manufacturing for Apple. In this case Foxconn also handles sales and distribution and even much of the actual electronics/hardware design. Think of it as Nokia is to Foxconn as Nexus is to Asus/LG/Motorola

This is likely referring to Qt. They use Wayland too, and these platform-ish things appear to be paving the way for Linux on the desktop.