Not sure if they edited their comment, but after "all of the above" they specify the 30kph as "if it's only a raised border" and not a full size wall/barrier.

Side note: Honestly, slapping a 2-3in stepped concrete block and keeping the cycling lane raised to match that step would go a long way in keeping people off it. People don't like driving on cracks, they'll avoid a large contrasting colored step like the plague

[–] rollin@piefed.social 1 points 4 weeks ago

after “all of the above” they specify the 30kph as “if it’s only a raised border”

Yes, that's why I asked if they really meant "all of the above" - I rather suspect they were just referring to the other measures that do make sense for both protected and unprotected cycle paths (only bicyclists allowed, distinctive paint schemes etc).

a 2-3in stepped concrete block and keeping the cycling lane raised

pretty sure this is what is meant by protected cycle lane - some kind of kerb between the cycle lane and the motor vehicle lane. There are many cycle lanes like this in Europe and they are unquestionably way safer. FYI you don't need to have the cycle path raised to the same height as the kerb - many do not do that, and just have a line of raised kerb stones on the traffic side of the bike lane.