Poor women of pension age were often in those groups in their younger lives. Every properly disagregated set of stats I've seen over the last couple of decades shows older single women in the groups most likely to be living in poverty.
Its not that surprising. Women currently in their 60s, especially later 60s and above were routinely discriminated against in the workplace, sacked for being pregnant or even on marriage, blocked from educational opportunities and barred from workplace pension schemes. It entirely to be expected that women who then find themselves single in older age will struggle when all they have is the state pension (if that) and its one of the lowest in Europe.
The reason the Ombudsman ruled in their favour was serious maladministration. This cohort of women were subject to very late change in retirement date, many were not informed and if they went to check with DWP were given incorrect information. I'm not a WASPI, I'm on a generation boundary so several years younger but I was also getting the wrong information from DWP until just a few years back as were a sizeable number of my friends.
Of course not all women in this age group will suffer hardship - there are plenty of "I'm alright Jacks" who were able to develop professional careers and access the associated pensions or who benefit from their DHs' contributions/pensions. But we also know that "they are all rich boomers" is bollocks and that the top 30% in this age group are doing nicely (especially the men) but those women in the bottom third in younger years are the very people affected by this change in old age.
As with the WFA change - it hurts those already poor more than anyone else and is glossed over by fudging everyone into one demographic, superficially doing ok. Kendall and Starmer were both stalwart supporters of these women (and pensioners) in opposition but seem to regard older single women as an easy target.
Personally I didn't vote Labour to see them targeting the bottom 30% in any age group, including boomers.