Just a quick little chime-in/chime-out to address Doctaru Ravenbe's acute observation:
Here's some clarification:
The kobold alchemists are not creating them in the sense of creating them from scratch, but more creating a new 'generation' of Eorzean-born bombs via the genetic manipulation and breeding of voidsent captured in the wild (the kicker being: those new bombs, while still classified as voidsent, were never actually "sent" from the void). Is a baby born in space of Earthling parents still considered an Earthling? Good question...
Hope that helps clear up things a little!