Yes, it is the AU-220M gun but without the "stealth" cover flap/structure as the CGI render on the article Ananda share.Thank you for sharing!
It seems that the two 20 mm guns (the South-African Denel GI-2 ones?) are already placed. We just have to wait for the Bofors 57 mm Mk.3.
Btw, can this be the AU-220M 57 mm gun on the first of KCR-60 class?
As for the 20mm gun, no, it's not Denel GI-2, if it based on prior photos of KRI Kerambit then it is actually Yugoimport-SDPR M71/08 20x110mm autocannon.
Basically a navalised single barrel version of the Zastava M-55 triple-gun with some kinds of EO based fire-control system on each gun.