This is a pretty common charade from Kathleen Stock, Helen Joyce and the like. Gesturing towards "equal rights" to not be one of the Bad Guys and then stripping the term of any material meaning
Some cis people might think John Boyne's opinion sounds reasonable. He says that trans women's rights should come second to cis women's rights when they conflict.
The problem is the "conflict" with cis women's rights is that a small number of cis women hate trans women and don't want to see them.