Just to note, that post is from more than a year ago, though it's true it got cancelled. The author said in that post he might try to continue the webnovel but slower, but didn't make any promises. Only 3 chapters of volume 6 are out(albeit the last one is from a month ago so there might still be some hope...).
The web version can be read here; https://kakuyomu.jp/works/4852201425154953954