What I could find is this article stating that there will be a playoff game in the 23/24 season.
https://onefootball.com/fr/news/belgian-football-clubs-pathway-to-europe-in-20232024-and-beyond-36799435
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Finally, the Europa Conference League second qualifying round spot will continue to go to the winner of the European play-in match. There are no changes to this. Here, the only way the European play-in
match does not occur is if the winner of the European playoff also wins the Croky Cup. In that case, the Conference League spot would go to the best team in the championship playoff not to qualify for Europe."