First off... It's a system rescue tool... Have there been any massive advancements in the state of the art of system rescue in the past 8 months that need to be integrated into this tool?
Secondly, since this is void mklive based, whenever you run it, you get the current state of packages. This means that the actual programs are never really going to be out of date at time of building. The project would only need to be updated to update the few boot utilities which are included in the iso, or to update the LTS kernel included.
To add a little to that second part, I'd say this is really meant to be "built on your own", following that brief example at the end of the README. The releases are more of a convenience thing.
You will need Void's package manager XBPS installed, though. It can be harmlessly installed on other distros and won't (shouldn't?) interfere with the host package manager.
Secondly, since this is void mklive based, whenever you run it, you get the current state of packages. This means that the actual programs are never really going to be out of date at time of building. The project would only need to be updated to update the few boot utilities which are included in the iso, or to update the LTS kernel included.