This is perhaps the same godling Susīma who was too lazy to follow Sakka's orders (SN 11.2). Another Susīma is a renunciate at SN 12.70.

Legend has it that on the slopes of Mount Meru grows the vast Jambu tree that gives the continent of India her name, “the land of the black plum tree”. The fruits of that tree are as big as elephants, and when they fall, their juice flows forth as a river named Jambu. The dried mud of that river yields gold nuggets whose unparalleled lustre is highly sought-after among the gods. This is that gold (Śiva Purāṇa 17.16–19).

For reading kālaṁ kaṅkhati bhāvito sudanto, see note in Bodhi, Connected Discourses.