Was some claim to a new concept made somewhere? I haven't seen this.

A new realization of an existing concept can be notable.

To be fair I have been talking about event sourcing for over a decade. The concepts have been around far longer than that. In fact most databases "event source" their own internal structures.

There is however benefit to modelling a system in that way and not just an internal transaction log. I have done many talks on the subject and you should be able to pull one up on youtube etc fairly quickly (its a bit much to go through in a comment).

Few things are new concepts. Not being a new concept doesn't mean this is interesting or useful.