I stayed at the Kokumin Shukusha above T36 in 2017, i think. I was there but didn't spend the night in 2018 and don't remember thinking it was closed. If it has closed since then i haven't heard about it. Next time i go by i'll check and post a note one way or another.
As for providing updates to 88 Route Guide, there is a special page on the forum for that. All corrections, suggestions, etc. will be passed on to the publisher just to make sure he sees them. But, he's already a member of the forum so he may see them in any case.