Most of the concepts explained in these articles are correct. While the design time of OpenAccess has changed and we are introducing new features and are polishing old ones, the concurrency control has been left untouched. We will take notice and update the new documentation regarding concurrency. However for the time being you can use it.
In order to use a timestamp column for concurrency you need to select the class in the diagram, press F4 and in the property pane for concurrency mechanism select backend. Specify the concurrency member as the timestamp property you desire. This should do the trick.
I hope this is helpful and please make sure to address any other issues you face with us.
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