Apart from tamilbrahmi - which is widely discussed of late, details re KONGANAR SIDDHAR are more interesting, informative and will pave way for detailed research.
Konganar has always related to Thirumala Hills ..
This find - with nearby Konganapuram etc., and Sangam Muthirai - is indicating pointers to look into the age / directions of Siddhars - particularly Kongana !!
As PS readers - we will always recollect : MEKEZHUNDARULIYA DEVAR @ Kandadithan !
Whether that is related to WEST of CHOLANADU (of his time) - viz. Kollimalai - or Western Ghats or something similar to the one which is found !!