Well, the image itself is from a conservative group
In 2019, a conservative Catholic Spanish group launched a bus campaign against 'Feminazis' with an image of lipstick-wearing Hitler, as a protest against sexist laws on domestic violence, demanding that laws are made gender-neutral.
So the IRR article is using various images from right-wing campaigns:
Illustration from a Hazte OÃr bus in Spain calling for the repeal of the 2004 gender violence law and legal protections for the LGBT community.
(The reference to LGBT there seems to be made up - the bus was specifically about the gender violence law).
But then the article itself is complaining about feminists:
Why are some feminists peddling the far-right agenda?
Just as scientific racism centred on supposed biological differences to classify humans in a rigid racial hierarchy, ‘gender critical’ feminists are propelling biological arguments that essentialise sex and its relation to gender identity, contending that sex is purely biological depending on what reproductive organs you have. Their arguments amount to a fundamentalist approach to biology, that labels anyone who doesn’t conform to a normative view of ‘womanhood’ or ‘manhood’ as abnormal, which ultimately increases the vulnerability of an already vulnerable group of people by segregating them as ‘other’.
Something of a confused message. Calling feminists far-right, while also complaining about groups calling feminists far-right (but appropriating that for LGBT somehow), and using their imagery.