This article claims yes.
'In a landmark move towards inclusivity, the Women’s Prize Trust has confirmed that trans women will be eligible to enter the 2026 Women’s Prize for Non-Fiction. The decision marks a significant evolution in the prize’s eligibility criteria and reflects ongoing efforts to ensure the award is representative of all women’s voices.'
https://www.scenemag.co.uk/trans-women-eligible-for-2026-womens-prize-for-non-fiction/
However, the quotes are very bland, say nothing at all about including males who identify as women, and I can't see anything relevant in the eligibility criteria.
Because of course if a prize is set up for women, it can't include men, or it would be contravening the Equality Act.
I suspect the article is stirring.
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