On one hand, the suicide rumour started off a twitter account that was never confirmed to belong to Koronba on the first place (however, the dates during which those tweets were posted coincided with him taking down those few works he still had up online, thus giving some credence to it).
On the other hand, there's nothing really disproving some of those anonymous musicians of actually being Koronba under a different alias. Although, wasn't 全てあなたの所為です found to be another artist who also goes by the name "Geniway"?