With regards to using the name Jonathan Yaniv and male pronouns in my OP -
I believe this is consistent with Mumsnet Guidelines. Yaniv has a long history of harassing women and children that predates his transition. It would not surprise me if he became known as the Karen White Of Canada. Karen White is explicitly referenced in guidelines as an acceptable use. Excerpt below:
What about, for example, Karen White – is it ok to say he is a man and call him 'he'?
We think we've allowed for flexibility and context here; we’re unlikely to delete where an individual is primarily known for extreme or criminal actions undertaken before they transitioned.
Yaniv’s long history includes adopting the online persona of teenage girls to interact with teenage and tweenage girls. He claimed he was doing this in the line of work but copies of the communications show comments of a sexual nature.
He has talked online about wanting to help ten year old girls with their first period with inserting tampons.
He has harassed women from ethnic minorities (predominantly Sikh) (the word ‘racialised’ was used but like a previous poster, it makes me irrationally annoyed for linguistic reasons) who were lone workers in their home or clients’ home to wax his testicles. When they refused, he filed legal complaints against (I think) 16 of them. He lost.
He has physically attacked more than one person in a way that I would describe as (trying to tread carefully here) consistent with male patterns aggression and violence.
There is more. Googling his name will lead you to much more information. KiwiFarms may not be the preferred source but they have a very large forum devoted entirely to him and they reference and archive information very well.
TLDR - I think it is appropriate and in keeping with Mumsnet Guidelines to use the name Jonathan Yaniv and male pronouns.