My clan still has the extra XP bonus. Pretty sure this only for individuals, like for your members, so you get extra regular XP to rank up your personal profile. Not Clan XP. Very doubtful that they would award you for past stuff. If they indeed did not have this for previous CW's, guessing this is a new feature. My clan's last two wars in Platinum have had the XP bonus the entire time in between.
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