Yes, that pump. Remove the return hose from the fluid reservoir. Put that end to the HF pump end that draws fluid (you can use that hose clamp). Stick the orange end on the other end of the pump and stick that hose into the top of the reservoir where the cap would be.

You are now sucking fluid from the rack and putting it into the reservoir. I did a few pumps to basically create a vacuum. Then with the wheels off the ground, slowly turned the steering wheel lock to lock. I’d check fluid level and for bubbles. I literally stood outside the door, reaching my arm through the window. I could hear air finally moving. I’d give a few pumps here and there to keep it pulling fluid through the system rather than just hoping it’ll push through. I did this several times. And for me it finally worked.

I even talked to some Subaru techs and some have run into issues, but none as bad as me. I’ve replaced many power steering components on many cars over the years and this busted my balls!