When an organisation requires identification including gender/sex, how does it acquire this? The word of the person? A quick genetic test? No. It's via a certificate.
This is back to the idea that female is anything a man can achieve, and not what they cannot. Female becomes hormone levels and certificates and not the sex that becomes pregnant and gives birth.
What TRA is doing is redefining women and claiming the name. These men aren't becoming what they want, they are changing the meaning of the word and pretending that's enough.
If sex is a certificate, without a certificate does anyone have a sex? If sex is hormone levels, do we change sex if we develop hormonal disorders?
'Transition' is a concept but not a reality. When we need to know who is male and who is female, for medical treatment for infertility for example, a certificate, hormone levels and a deeply held belief that's likely to last a life time is irrelevant.
The argument has always been, and will always be, where the 'need to know sex' line is, not where the 'transition' line is. Because transition doesn't change sex.