I appreciate articles like this, if only because they make me feel like feminist concerns are at least a little validated. I am happy for the writer if he is living a better life, but it sometimes feels a little difficult to think someone is "fighting patriarchy from within" when they've essentially technically tried to join the patriarchy... I've argued before that trans men can easily be allies of feminists, and that my own philosophy of feminism actually includes them automatically - it is their own ideology that might keep them out, not mine.
However, my biggest issue is with the following passage:
But advantages one may have had in the past because of your gender do not erase difficulties you may face once you have transitioned. Equally, disadvantages I may have faced as a woman cannot be deleted from my lived experience now that I’m a man.
The author here feels like he is being inconsistent. Either previous lived experience (with advantages and disadvantages) is materially relevant, or it isn't. You can't really argue that a trans woman's life lived as a man is not all that relevant to how they view life now, and then say your own experience of years lived as a woman is very relevant to your life as a trans man.
Either our early experiences fundamentally shape us, and need to be kept in mind when thinking about things like narratives and political representation, or they don't. You can't have it both ways.