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Good news from Tensility: the connector I have chosen, 54-00177, has its metallic parts - inner and outer contacts - fully gold plated.

In addition to the research on the plating, I found out that connectors with the same part number, even made by same manufacturer, may have different datasheets, with differing dimensions, differing material of contacts, differing plating... wtf... see below - the connector I used before. No dates on the sheets to identify which one is latest.

Update: after some more research I tend to believe that contacts themselves, the pieces of metal touching the plug, may not be coated with anything at all. These contacts may be bare nickel (as declared in datasheet), or "copper alloy" (which one?) or phosphor bronze, which all are seem resistive to corrosion and provide good contact. And all this gold and silver stuff is about "solderability" and units looking deluxe gems.

I am waiting for feedback from CUI devices and Tensility.