It ended up taking a little longer than we had hoped, but the remaining WineConf 2018 videos are up at [1]. I'm mostly to blame for the white-balance in the video and the recording levels in the audio. Please thank Stefan for turning the raw audio and video into something we could publish, and of course all the speakers for giving us something to record in the first place.
[1] https://peertube.mastodon.host/accounts/wineconf2018/videos