Note the difference between
most women
and
A) Women were choosing to march beside the messages.
B) The organisers, of whom some are sure to be women, were not getting the police involved to remove the signs under public order offences
[Less/fewer etc]
Women attending had been informed of prior march signs highlighted by as you say they "very predictably lead the right wing media coverage" so aware of the VAWaG message used as part of the political message.
And if protesting as an informed protester will be aware of how MRA overlaps TRA when it comes to womens rights.