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I took that as a kerb to be honest. I can't see how you can "fix" a kerb... The easiest thing would be to add a transition to one side, but then is the council facilitating liability, it's a bit of a minefield. I think the idea is to stay in the lane until the signal. I wouldn't traverse that at speed unless primed with a bunny hop. The potholes up here are a lot more deadly and require regular hops. I hope he gets well soon.
10cm might be right if it's stepped slightly like the tracks at Oval?
It's more clear as they went with kerb edges and then white lines but if they abruptly end the stepping at the ASL that could be more an issue.
https://www.google.com/maps/@51.4817798,-0.1111918,3a,75y,120.9h,84.49t/data=!3m9!1e1!3m7!1sHakGOK0a3s7LwjbYVPm_Mw!2e0!7i13312!8i6656!9m2!1b1!2i38