Claim: The episode 1 of Gate Keepers 21 was originally aired in 2002.
Evidence: No. "Encounter"
Transcription: "Deai" (Japanese: 出会い) April 24, 2002 (2002-04-24) 
April 24, 2002 – January 8, 2003 The OVAs were periodically released from April 24, 2002 to January 8, 2003.