At the Musjid a short but loud Dua is read after the Fardh Salaah, is this in accordance with the Shariah?

Answer

The loud dua after Fardh Salaat is bid'ah. The imaam of this Musjid, like the imams of many other Musaajids, is at pains to walk along two divergent paths at the same time: the path of the Saudi Salafis, hence his Saudi garb, and the path of the bid'atis and juhala with his bid'ah dua. He is neither here nor there. He flounders between two baatil extremes.