These are the new bus stop locations, the old bus stops are just next to Fourth Road.
Please see note/4928603 for details.

Fixed on changesets 171675905 and 171676614.

Don’t worry for this as I’ve got all the relation numbers for those, will perform a partial revert in later time with the original configurations.

What the point for deleting the Southern River extension trips for the route 214 as those trips still exists on PTA data and Transperth website?

The public_transport=stop_position tag shouldn't be added to the bus route relation as it will reporting on the OSM Inspector as an Unknown role in a relation.
Please see osm.wiki/Buses#Adding_bus_stops_to_the_relation

Transperth's Spatial Data tells who's operating with those bus routes around areas in Perth and its regional areas.
https://www.transperth.wa.gov.au/About/Spatial-Data-Access

okay got that, as the newly built road is very close to the Railway Parade intersection. :)

Looks like the road next to Bayswater Station is connected directly to Railway Parade rather than Rose Avenue by survey outcome.

Just wondering is there a way to tagging with the CAT ID number from the CAT services in Perth area (I've used "ref:AU-WA:PerthCAT" as an example), if it's okay I can do the same for Joondalup and Fremantle area as well.

When attempting to split up the road segments, it needs to take caution which node to be split up to avoiding the route to be invalid.