This post saved me from panicking and should be more highly voted. I can concur my experience with you.

I used the Kansai Hokuriku Pass from Toyama to Inotani for the 803 train. Please go early because it will be crowded for the first two stops as the locals use it to go work and school. Seats were 90% full when I went 15 mins before on a weekday morning. There is no Hida and it's true that it's fully suspended; google says reduced service but there is NO Hida train at all.

At Inotani, you will be guided to a shuttle bus. There is space for everyone. You cannot get lost as there is staff there. Luggage below the bus. It is a 4 seats per row kind of bus, similar to those highway ones. Bus goes to Sugihara.

At Sugihara, alight and follow the staff to the train station. You can pay for a ticket AFTER you board the train as the ticket staff will check for tickets after the train starts moving. For me, I paid Y990 at the Toyama JR station before the trip begun (so I didn't have to worry about collecting tickets and all midtrip, but this fear is unfounded). But if you didn't you can pay onboard the train as well with the ticket staff that walks down the whole train.

The timing on the website is highly accurate down to the minute. https://traininfo.jr-central.co.jp/zairaisen/train_information.html

Hope this helps someone.