Let's look at what TT has to say about WHY, shall we?
-------
TT believes "...the state had already agreed that he was a man and issued a certificate to prove it, TT believes he should be recorded as the father"
TT "...claims that the state is breaching the terms of his gender recognition, which says he should be treated as male “for all purposes."
TT says "...it denies them “access to parenthood in their acquired gender and undermining their trans identity”
TT says "...it’s unfair and “illogical” to make him explain to his child why he is a father in real life but mother on the birth certificate."
-------
Not seeing an awful lot about the actual child in all of TT's self-absorbed ramblings. It's almost as if it is ALL ABOUT TT. Who'da thunk it?