How to calculate TAS and fuel for Diamond DA20-C1?
Your steps are all correct, as is your answer.

I'm confused by the &quot;standard temperature&quot; heading in the table.

Consider this table from your first link:



The column I put in a green box, if it was the only one, then the altitudes would all be density altitudes -- just like the table in the question, with the label &quot;Standard Temperature.&quot;