Being critical of gender identity ideology is not confined to feminists.
Lots of people might not be particularly interested in the transgender issue from a feminist perspective, but they do care about things like free speech, people being harassed and fired for voicing disagreement, schools promoting ideological propaganda and young people being swayed into making irreversible decisions, science denialism and shutting down of any critical research into the area of transgenderism, secret lobbying without adequate political scrutiny, women's sports being affected, their daughters or elderly female relatives not having access to single sex services or same sex staff etc.
You don't need to be a feminist, nor be involved in feminist theory and analysis to find the growing extremism of trans ideology deeply worrying.
The more that people speak out about their thoughts and concerns and experiences, the better - parents, teachers, scientists, medical practitioners, politicians, civil servants, right-wing voters, left-wing voters, transsexuals, LGB activists, detransitioners, and so on.
Everyone is coming from different angles and viewpoints and it is vital that the snowball effect keeps going. There will be some overlap with feminism, and disagreements in other aspects. That's ok. This isn't some minor spat between different factions in feminism as I once used to think. This is a deeply regressive and authoritarian ideology that has serious ramifications on our society.
I don't know much about Debbie Hayton, but the article seemed balanced and insightful. It is a useful resource for those who aren't familiar with AGP or think feminists are mistaken for discussing it because it is 'unrepresentative of the trans community'.
It is quite possible that Debbie's own opinions and self-awareness has evolved over time and it must have been difficult to be open about something like AGP.
Their voice adds to the discussion and the harassment they have endured due to being public about their opinions shows how even trans people are not safe from the gender extremists.