From the article: "But the IMF adds a caveat to the proposal: It should be conditional on employment so that highly-educated mothers are prodded into the workforce."
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I would expand that caveat to note that it is conditional on these women actually getting NEW good-paying jobs and not displaying existing workers.  If the women go to work but their husbands lose their jobs it might help gender pay equity but it will do nothing for either family finances or government finances.

It is a pretty big assumption to think that having 150,000 people joining the labour pool will result in 150,000 more full-time, good-paying jobs and therefore boost economic growth.  The study also predicts significant 'knock-on' effects from those 150,000 jobs as they are estimating $8B in new tax revenue from those jobs, or $53,333 per job.  Obviously most of these women entering the workforce will not be paying $50,000+ in income taxes, so a lot of that extra revenue is from other sources.