I think it's fine for them to extend the deadline to 6 weeks. Two weeks was far too short.
There was always going to be an enormous amount of pressure on the EHRC following the Supreme Court ruling from both sides.
The law is crystal clear though. A GRC does not make someone the opposite sex and female facilities are for females only.
I do think they will need to clarify the part that is giving the most concern, and leading some to interpret it that transmen will not be allowed to use either male or female facilities.