How can this way be bus=no when there is a bus route relation on it?

Only small minibuses Perhaps tag minibus=yes ?

Is there a bus connection here?? EBS seems to report service from line 105 from stop Botlekstraat to Prof Gebrandyweg.

Unable to answer "Is it restricted who may park here?" for https://osm.org/way/87974026 via StreetComplete 17.3:

this is for dry parking boats

Asphalt

Paving stones