Seems pretty clear to me that he didn't approve - to the extent that he was prepared to breach the student's right to confidentiality .
"When the biologically female 17-year-old A Level maths student requested to be referred to by another name and pronouns, the 59-year-old refused, then wanted to tell the student's parents about this but was not allowed.
The school’s guide to supporting transitioning students is said to state that staff should "maintain confidentiality and only tell others about the person’s trans status with their permission".
This put Mr Lister in what he described as "an impossible position". He told the tabloid: "‘I wanted at least to make sure that my student had parental support and was making an informed decision."
https://www.swindonadvertiser.co.uk/new ... s-student/