This appears fixed in recent versions on my Debian system:
# ./aptitude install tf
E: The value 'etch' is invalid for APT::Default-Release as such a release is
not available in the sources
Does this still affect you?
** Changed in: aptitude (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/428545
Title:
aptitude Silently ignores invalid Default-Release.
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