Ah, dear brother!
Dr Israr Ahmad (1932-2010) was a very enthusiastic, motivational and sincere Muslim. Despite some N2I he was an extraordinary scholar of Islam and Comparative Religion. He also wrote authoritatively especially on Indo-Pak history. He was an expert on Iqbaliat as well. Ironically, another good scholar Javed Ghamidi vehemently opposed his ideas.
We lost much in him in 2010. He speaks strongly against usury in this lecture. But no Muslim organization has come up with a workable interest free economic system yet.
May Allah bless him!
Another good lecture by Dr Israr on the side of your link