Hello!
In Japan, highway=cycleway is used for roads that are only open to bicycles.
Since The Lake Hamanako Tour Bicycle Road is also open to pedestrians, highway=footway is appropriate for this road.

JA:Tag:highway=cycleway
https://wiki.openstreetmap.org/wiki/JA:Tag:highway=cycleway?uselang=ja#日本での解釈

JA:Proposed Japan tagging/Road types 2/cycleway
https://wiki.openstreetmap.org/wiki/JA:Proposed_Japan_tagging/Road_types_2/cycleway

Also, you have removed the name and other information from the existing data.
So I will partially revert this changeset.

There are other tagging rules specific to Japan. Please check the following page.

Japan tagging
https://wiki.openstreetmap.org/wiki/Japan_tagging
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            Published using OSMCha: https://osmcha.org/changesets/134269225
            