Yeah, hard to see how better this is than Gradle. If anything, it's worse by the mere fact this is Scala, but it's really so incredibly verbose to accomplish basic tasks such as upload to Sonatype.
making it easier to generate maven poms I thought was a reasonable idea 18 years ago but gradle and other tools all went down the "making the build Turing complete" path.
https://github.com/spullara/graven/blob/master/pom.groovy