No, that’s wrong. This has nothing to do with Gateway-Extras. This device-thing is wrongly initialised.
The log messages indicate the binding received state messages for datapoints to non-existing channels. The thing object does not contain these channels, although these should exist. Have a look here: Homematic Binding: "Channel not found for datapoint" errors for definitely existing channels
My problems with that were solved by delaying the rule engine on a start: Cleaning up the startup process / renaming rules (windows possible)