Yes thank for posting, it's relevant to this:
Gender critical councillor challenges Cornwall Council over trans comment complaints | Mumsnet
It's complicated, isn't it - the councillor is GC, the subjects of the data breaches are pro-trans, the GC councillor is stating that their data privacy rights have been breached, and passed that info onto the ICO on their behalf.
But she also distributed their details even further, because she was obliged to, apparently
Cllr Tudor said that because of these complaints, she had to pass the information on to the Free Speech Union, which is representing her, as part of her response, meaning the information was shared even more widely.
It's like Snakes and Ladders with data