Ha. Alix's male advantage is blindingly, blindingly obvious - I suppose I interpret her saying, "...It’s part of my identity… I play rugby… there’s a pride in doing that because I didn’t think I could [play]…” as meaning that, even as a much younger man, she wasn't able to play competitive rugby [possibly as a result of being too small?], but it says everything that even aged 54 she can as a 'woman', and is even one of the physically strongest players in the team...
The club captain defends Alix... it might be hard to reliably find a full ladies' rugby XV at that kind of level, and I could imagine [especially with, presumably, no childcare etc responsibilities], given how much she seems to get out of it, that Alix will reliably show up every week no matter what... but that club [somewhere in Newham] is in a majority Asian area, surely that's a much bigger pool of untapped talent out there, which you presumably close off completely by picking a TW?
It is probably fair that, shortish and aged 54, Alix is no Hannah Mouncey, but, still, 'case by case' just doesn't work in a situation like this, it leaves really difficult decision making in completely the wrong hands. A blanket 'no', at any level, to TW's in any women's collision or contact sport is the only halfway sane policy. Never mind fairness, safety has to come before inclusiveness.