TK to TK dates are not known. This is probably a dry run draft from way back when unless we have been seeing a body double this whole damn time.

"To come" is a printing and journalism reference, commonly abbreviated to "TK". The abbreviation is used to signify that additional material will be added at a later date.[1]

Originally, TK as an abbreviation may have come into use because very few English words feature this letter combination. Potentially by contrast, using the phrase "to come" could be mistaken as a deliberate part of the text. Plus, TK, and especially the repeated TKTK, is a unique and visually arresting string that is both easily seen in running text and easily searched for, helping editors ensure that placeholders don't end up in published text.