"ads with lengthy bullet points detailing the role's responsibilities will face a drop-off in women applying for the job" Maybe women just don't like too much responsibility or hard work? Maybe for that matter, no one does? Have they even checked what effect their proposed changes have on male applicants? For example "coding ninja" would surely also be off putting to many men.
Wasn't there a study concluding that women tend to under-estimate their skills and men the opposite? If we assume that to be true, a long list of responsibilities is more likely to put off women because they don't think they can cover everything (or enough of it).
In any case, I don't think there is a law of nature or a biological force that makes women underestimate their skills. Plenty of women don't underestimate their skills.