It seems that all web apps in https://github.com/SAP-samples/cf-mta-examples/tree/master/content-deployment/content specify destinations in the xs-app.json file. If these destinations are not set up, the webapps cannot be used as the approuter will throw an exception.
So the sample is ok if it should only be used to demonstrate the cf deploy ./ but it's not suited to show how to use the html5 app repo.
My ask would be to remove the destinations from the xs-app.json files