Swami Dayanand Saraswati Commentary : The one which is opposite to the ‘Parlok’ (= as per point 10 above), in which there is an experience of suffering specifically, is called 'Aparlok'.
In Hindi:
महर्षि दयानन्द व्याख्या : जो परलोक से उल्टा है, जिसमें दुःख विशेष भोगना होता है, वह 'अपरलोक' कहलाता है।