Strangely the AU component started working, without me changing anything I'm aware of. I'd already rebooted OSX several times. Something must 've been caching somewhere but I don't know what. It wasn't $HOME/Library/Application Support/AU Lab/com.apple.audio.aulab_componentcache.plist or $HOME/Library/Caches/com.apple.audiounits.cache because I've been running a post-build script that removes those all the time.
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