Hinduvta does not exist as a driving political force in Nepal. You are thinking of India. Nepal is secular albeit there is a small faction vying for power based on hindu ideologies but they are a very small portion of nepal politics. Again there is no communal flair that has entered into national discourse like we see in India or some ME countries. Nepal is pretty chill in that regards, surprisingly so given the whole country has multitudes of ethnic groups. There are still caste based incidents in remote areas but not so much in urban cores. Knowing the decisions the nincompoop leaders have done out of whim over the last decade or so I am fairly certain that this decision was also not done with due dilligence.