The above part number comes up as a two port "switch/gate" ( I use this term because "turbo boost solenoid " means different parts to different people with different cars)
I can't help with the ohms reading (but IIRC it is low), however Si Robb on his Utube channel until recently, had two videos about cleaning /stripping the valve inside the part down and cleaning it. ( crud makes it stick/ not move smoothly) I have the occasional over-boost issue which I place at this parts door. My 2015MY is a twin turbo D5 and IIUC this part opens a gate to move boost air to the 2nd (larger) turbo at about 2000RPM. As I rarely exceed 2000RPM I live with the occasional problem, which is why I probably got the problem in the first place LOL.
Hope this helps.
Cheers Bob.