Problem:
pagegenerators -ref option does not include redirects. This happens because pagegenerators.Factory calls page.getReferences() without any options, and filter_redirects parameter of BasePage.getReferences() is False by default.
Solution:
The default value for the filter_redirects parameter should be None, as in other methods. However, changing this now would be a breaking change. In the meantime the pagegenerators -redirects option can be used to decide how redirects should be handled with -ref.
See also: