If true, it might go some way to explaining why SW let herself go so much in TSP about the terrible unfairness of it all, and leaned so far into the fiction that their house was repossessed because of a bad investment which somehow, mystifyingly, resulted in their house being taken off them to repay someone else's debts.
It may be that she really felt that the 'Cooper' investment was their magic ace up the sleeve to pay off their mortgage despite not really working, hence it was definitely his fault when it didn't pay out.
Things are always other people's fault, whether that's people being mean to them when they say they're homeless, or the girl in the council offices, or Polly, or the Treen campsite manager, or the people they bumped with their packs in Padstow, or nasty Chloe H, the Hemmingses, or anyone who cast doubt on Tim's diagnosis, or the people who 'poured vitriol' on her after the story or 'issued threats.