I've used Mann filters before. I think both Mann and Mahle have the anti-return valve so should be fine. Pretty sure both have OEMed parts for Volvo too.
I'm currently still working my way through a job lot of Volvo oil filters I got cheap from Skandix in the brief period at the end of 2020 after Berlin had reduced VAT and before the post-Brexit bureaucracy came in.
If you want to get the transmission fluid completely clear you can always use the Gibbons method of flushing it through the cooler lines. This replaces the oil in the torque converter as well as in the pan. There is an argument that this is dangerous if the transmission has been neglected but once you're running nearly clear oil anyway it should be safe enough.
Is that 80W-90 mineral oil the right stuff for the rear differential? I've never touched mine on the basis I've always been confused about its type and the type of oil needed. I've never succeeded in finding the label on my axle.
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