I believe that Robin provided you with instructions for centralized deployments whereas you may need the ones for WiNG.
WiNG:
1 - Make sure that all WLAN are mapped to correct vlans
2 - Change the WLAN bridging mode to Local: https://extremeportal.force.com/ExtrArticleDetail?an=000082354
3 - Make sure that ge 1 port on the APs are trunked and allow all vlans in configuration
4 - Clean up config from any tunneling remnants
On your network, make sure that vlans are configured and allowed all the way to whatever destination you'd want your wireless clients to go.
BR,
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Christoph S.
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Christoph S.