The claim that was introduced in the article's closing paragraph is that The name "Denali" comes from the language of the Athabaskans.
The change of name was made by the former President Barack Obama as he was said to have renamed the country's tallest mountain from Mt. McKinley to Denali because it was its name in the native Athabascan language
Note that they closing case was that The Wilderness of Denali making a new case for their mountain’s name:
Therefore, The claim that was introduced in the article's closing paragraph is that The name "Denali" comes from the language of the Athabaskans
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