Someone linked to a site called trans widows.
A site offering support to those women who find themselves in this position. They are not barging onto a site for widows and demanding to be placed front and centre unlike those who TWAW types who do that with anything remotely reserved for women.
Therefore some are declaring themselves as widows.
No, they are declaring themselves trans widows, note the addition of the prefix 'trans'
They’re not widowed. Their spouse is still breathing.
Their spouse may well be still breathing but as the spouse has decided that they are no longer the person the woman married and that that person the woman thought she was married to is now to all intents and purposes 'dead' using the term trans widow is a perfect, reasonable description and fits entirely with the view held by the spouse.