Industrial IO board ST X-NUCLEO-PLC01A1 - design features
PGND and GND are not the same, maybe you find the answer in some app note.




The CLT01 is not supplied there (SPM), it's just a jumper for selecting different mode of SPI register length.



They have a footprint, it's in your photo. You can solder them and perform the test.

I do think so, this is the goal of this IC.