This is mostly PR and will likely not do any serious damage :) But it might do some good by setting a positive goal.

First off, it doesn't specify how biological men temporarily identifying as female during the hiring process are to be treated, which seems like an obvious loophole to me.

Second, the actual resolution says: "Where two candidates of different sexes are equally qualified, preference shall be given to the candidate of the underrepresented sex" and that "equally qualified" is another huge loophole. The average male candidate will have a lot more experience, simply because it's been a male-dominated field.

Thirdly, it is up to the member states to come up with appropriate punishment for failing to meet this and "could include fines" doesn't sound that strict to me.