Players banned for 7 or 14 days after 22/08/2017 wont get their season rewards.
But players banned, lets imagine, from 8/11/2017 to a further date will receive and maintain their season rewards.
So fucking fair, but you know what? Nothing that surprises me. Afterall we are talking about riot.
Source of the ss: https://boards.na.leagueoflegends.com/en/c/player-support/W0aEONuP-2017-ranked-rewards-help-desk