Are changes made with Everything -rename expected to be reflected in Undo History?
Currently, no.
I've put on my TODO list to add files renamed with -rename to the undo history.
Thanks for the suggestion.
I'll note that Everything -rename does not require use of -instance
If no -instance is specified with -rename the default unnamed instance is used.
but if you do use -instance, -instance has to come before the list of filenames.
-rename will eat the rest of the command line, that is all command line arguments following -rename are treated as filenames to be renamed.