But this is largely a comment disguised as a variable name, and is no more or less likely to stay up-to-date as a comment. If the Dell Identifier were to ever be changed to "DuplicateAssets", you're just as likely to have

  sillyMisspelledDellSOAPIdentifier = "DuplicateAssets"

as the original might have

  if i["DuplicateAssets"] is not None:  # Not a typo...

And your method replaces one line of code with two.

Comments have problems, but they solve problems too. They're not evil.