I don't think NOW is the only thing to blame, it's also the contract they have with WarnerMedia, NOW/Sky can only show what they are allowed to show, and within a timeframe.
As for the Slovenian, Serbian and Croatian audiotracks, it shouldn't come with much of a surprise, especially as HBO Max is coming to CEE next year, they want to keep some consistency and crossover between the streaming service and channels considering that HBO Max will be bundled with pay-TV packages, but this is a long thing coming, it was originally proposed back in 2015.
On the topic of crossover, both Cartoon Network UK and Boomerang UK have started airing cross-promotion Next bumpers again.