IPSO's guidance changed last year. It's perfectly fine for newspapers to use sex-based pronouns.
This is what the guidance says - note that it says journalists should take care "not to publish inaccurate and misleading information":
Journalists may use various methods to ensure coverage of sex and gender identity is accurate. These may include, but are not limited to, providing information, presenting different opinions where relevant, and approaching second sources.
Journalists should consider whether information about an individual’s gender identity is genuinely relevant to an article. Examples of relevance could be where a quote needs to be contextualised or to explain the inclusion of a source.
Language relating to gender and identity is nuanced. Journalists should take care not to publish inaccurate and misleading information.
https://www.ipso.co.uk/media/2423/guidance-sex-gender-identity.pdf