Ionic/Cordova isn’t supported in Couchbase Lite 2.0 …as yet. That blog post is for Couchbase Lite 1.x which leverages the REST API supported by Couchbase Lite 1.x. That API does not exist as yet on 2.0. Also, note that the replication protocol between Couchbase Lite2.0 and Sync Gateway 1.5 is completely new - It is not longer http. I
Please check this link for list of platforms currently supported on Couchbase Lite 2.0