I decided to hear him out and I completed the entire video.
In short, he blames current crisis to mix of corrupt politicians, mismgmt. of foreign loans and predatory lending by West. He proposes SL to become more industrialized and integrate itself in Asia's monetary system rather than West.
This is very insightful well-balanced commentary, and counterpoint to simpler explanations like Rajapaksa's corruption, China's influence, or organic farming, as the primary cause.