It's a misleading headline. Actually "a leaked letter from a University Hospitals Sussex NHS Foundation Trust medical director said milk produced by trans women, with the help of drugs, is “comparable to that produced following the birth of a baby”."
By which they mean when they tested it, it was nutritionally similar.
They later said "human milk" was better than formula.
I think there is only one example of a male successfully stimulating lactation, and they were able to produce less than an ounce a day. So not enough to feed a baby.
Its a bit of a scaremongering story to be honest, and I feel a bit sorry for the NHS trust who were trying to respond to a question in good faith.