As far as I know, remove from index doesn’t work, and hasn’t ever worked in the couple of years I’ve been around. What should work, though it’s sometimes reluctant, is to change your archive frequency to No archives (which doesn’t delete anything, just tells Blogger not to generate archive files), then either back to weekly, or if that doesn’t work then No archives, Monthly, No archives, Weekly. Eventually, that should force Blogger to look at what really exists, and only list a week once.