Hi Steve,
not sure, but I guess this terminal is still not operational … I have also looked directly in the AIP and here this concourse is also not visible on the airport diagram. Therefore I guess (and you see this on google maps also) this concourse is still under construction …
Here directly from the AIP Thailand:
Hope that helps - I´m pretty sure, that when this building is up and running you will see this also in the charts.
Cheers,
Richard