Yep, we're monitoring Google Travel and will develop an integration when it coalesces into a viable source of traffic. Like that article mentions, the vacation rental side of Google Travel is in the nascent stages and they're still changing a lot of things all the time and haven't solidified an offering or pricing model.
Right now, if you have channel integrations like VRBO/Airbnb/TripAdvisor/booking.com, you're already listed on Google Travel via those channels.
The list of other PMS's you mentioned from the article is a list of PMS's that haven't yet started building Google Travel integrations.
