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I noticed Push API directly refers to "System Messages" as defined by SysApps' [runtime] spec. Based on the Note at the top of [runtime], it appears work on that spec has stopped. As such, the Push API spec needs to "resolve/address" the dependency on the System Messages feature [runtime] <http://runtime.sysapps.org/> (Related thread <http://lists.w3.org/Archives/Public/public-webapps/2014JanMar/0615.html>).
The Push API spec no longer references SysApps' runtime spec so this bug is now considered invalid <https://w3c.github.io/push-api/#references>.