Let me confirm.... The front tension strut is attached to the ball joint in the carrier with a 22mm nut...The ball joint stud has a hex recess so that you can hold it steady while you tighten the tension strut 22mm nut onto it?

You should be able to remove the 22mm nut with an impact gun without holding the hex head. if you get the nut and tension strut off, you should replace the ball joint with the hex recess

If you can't remove the 22mm holding the tension strut (which is not what you are describing), you can simply cut at verticle slit in with a dremel or grinder to remove it

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'99 E39 528i 5-speed 130k
'06 325Cic auto 115k
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'03 530i - manual swapped - 430k miles-SOLD