Much of what this page actually says is accurate information about the cognate words for Easter in other languages (mostly versions of pascha derived from the Hebrew for Passover), as well as the reference in Bede the Venerable to taking over the name from Eostre.

The theories of parallelologists who think this is a reference to Ishtar and a Babylonian goddess are widely discredited.

Which leaves your specific question about Easter possibly coming from auferstehung, which strikes me as wishful thinking. The main concern about such an etymology is that they reference Nick Sayers, and give a link to this page. It is full of wikipedia links and elements of the argument from the first link on AiG, but the whole etymological argument is based on merely footnoting some German-English dictionaries. So that is no scholarly work of etymological origins.

I think one can safely consider Easter < auferstehung to be unsupported within the arguments provided.

The standard, most widely accepted etymology of Easter is that it comes from "Eostre", the Anglo-Saxon goddess of spring (source: Achtemeier, HarperCollins Bible Dictionary, 1996, p. 255). Her festival was celebrated at the spring equinox, around the same time as the Christian Easter/Pascha.