It should be noted that while this might be uncommon for learner’s materials, it’s extremely common for materials aimed at native students. Sentences like this would not look strange to Japanese people at all.
The main issue is that Japanese people already know the full words, so when they see 出じょう, they know that it has to be しゅつじょう and they recognize why じょう isn’t written in kanji. Learners aren’t going to be able to parse it as well.
But still, I don’t want people to be left with the impression that WK is doing something unprecedented.