Were you able to find a solution for this on the SAP community? This reply will also bring the topic up again in the Tableau community.
Can I get some more clarification on what is being asked? Is there a specific concern for why you want to know the connection modality? I might be able to better assist if I understand the reasoning behind the request.
The best information on connecting Tableau to SAP Hana can be found in the Online Help: SAP HANA - Tableau But I do not believe this will have the specific details you are looking for.
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if I understand your question correctly, I'd recommend to connect to a BW/4HANA system using the HANA ODBC interface. In the link you provided this method is referred to as 'SQL approach'. The MDX interface has even more restrictions - please search SAP notes on this topic, there is a list of features not supported connection via MDX - and the direct HANA access offers much better performance.
BICS and INA are the interfaces SAP is using for their own frontends and cannot be used with 3rd party tools (e.g., Tableau).