Suggestions for lawful and thoughtful responses?

[Equalbutdifferent]

Have just completed a survey which contained a section which appeared to be there to determine if respondents had protected characteristics, but rather than asking about sex, asked, a) for gender identity, and b), if gender identity was different than sex observed at birth? I struggle to see how meaningful data on possible sex discrimination can be extracted from these questions so was tempted to drop a line making that point. Any ideas how to do this without sounding discriminatory?

Have also observed an entire programme of events for IWD being delivered that only referenced gender. Same question?

If this is a public sector organisation you can also make reference to the Public Sector Equality Duty
www.equalityhumanrights.com/en/advice-and-guidance/public-sector-equality-duty

The PSED is based on the protected characteristics in the EA2010. So if they are not collecting data on sex, how are they fulfilling the PSED?