Presumably, from Target’s use of the words “guest information,” this additional data wasn’t related only to customers who actually purchased something from one

Presumably, from Target’s use of the words “guest information,” this additional data wasn’t related only to customers who actually purchased something from one of the company’s stores during the November-December 2013 timeframe, but also potentially to anyone who has ever interacted with Target in any way. ... well no. 'Guest' is just how Target refers to customers, its just corporate speak.