The first entry is always the pin's source. Overall confidence is a weighted average of how firmly each reference supports the start and end times used above; a reference counts half as much for every 180 days older than the newest.
Happened as dated, per macrumors.com: "…s for the new 10.5-inch iPad Pro, which was introduced at the Worldwide Developers Conference last w…"
Apple's own newsroom announced the 10.5-inch iPad Pro on 5 June 2017, with orders opening immediately and wider availability the following week, several days ahead of the pin's stored 13-14 June date which corresponds to broader hands-on/retail availability.
CNBC's own headline and 5 June 2017 publish date confirm Apple[2] unveiling the 10.5-inch iPad Pro, matching Apple's own announcement date and preceding the pin's stored 13-14 June availability date, though the page itself could not be verified directly.
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