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@ElGato
I had the same problem once and that tool did not do the job as it was slipping of the edges of the cup, and it's short so you will not have much leverage to unscrew a seized cup. Even though I've put loads of penetrating oil and blowtorched through the BB shell to see if the cup expanded.
I did cut a slot across the cup (not all the way, like a screw head) with a Dremel (quicker with a bigger tool) and I've tapped in the flat end of a mini pry which is about £3 from an ironmonger. Like this one
https://www.tomboytools.com/shop/HAND-TOOLS/!Mini-Pry-Bar
Put the other end on a vice and used the frame (on its side now) as leverage making I've rotate it the right way (clockwise or anticlockwise depending on the BB thread you've got).
Mine gave in the end.