One view on this statement by the Niger embassy in Paris could be that they are competing for "business". Niger not exactly being the richest country in the world, their embassies need to make as much money themselves and therefore would have an incentive to make such statements.
Nevertheless, I would prefer not to risk it if I had the time to make arrangements prior. Which may not be the case so I may find myself in Niger's Sebha consulate in a couple of weeks' time. Also, Niger consulate in Tam is quick and easy in issuing visa.