@mismarca Well, most authors will stop updating their WN after they're being serialized. Either the publisher said so, or their own accord(to reduce effort). Most of the authors only write at Syosetsu to have their work recognized(If they are rejected by the Editors of some novel company). Sad, but it's real.
Anyways, why would they even write a draft novel when the storyline deviates from the LN anyways, it's a waste of brainpower unless you really are having fun writing for others to read.