I gave a talk yesterday on this subject under a Sangita Lakshana Lakshya series organised by the KV Ponnammal endowment. Here is the YouTube link to it

The talk proper begins at the 25th minute.
I would classify it more as a narrative of a string of events that shaped the way Madras developed into a centre for Carnatic music.
There may also be a couple of factual errors on dates.