"If your vehicle makes it difficult for you to meet these requirements, you need to make them as closely as possible. "
Looks like he was wrong
No, he was right. The rest of that link also says, "Number plates must
be clearly visible from 20m at all points in the shaded areas marked "A".
'Must' is the word you need to obey, if you have bent them into a JDM slot and it can be seen/read by everyones favourite cameras and people you probably wouldn't have a problem, but if you have bent an angle great enough so they can't you're in the book.
It also says - for people who may read, "You need to make them as closely as possible"
as "Oh I can make my own" - this, "Unauthorised number plates
Displaying number plates that haven't been issued by VicRoads on a vehicle is an offence under the Road Safety (Vehicles) Regulations (except for 'home-made' plates on exempt trailers). This includes the illegal re-manafacturing of existing number plates issued by VicRoads in a different format, style or material"
In NSW you can't bend a plate at all to fit, they call it, "Defacing the plate"
People can always bring up examples where they went through an RBT site X amount of times and the police didn't say anything about the plates - but one day you'll have the pleasure of meeting a highway patrol/traffic cop who really
knows the legislation, takes their job very seriously, doesn't have a sense of humour - and spots you out for a cruise in your garage queen. He yanks the plates off your car, gives you a stinging fine and loss of points - and then says as you don't have plates on your car anymore you can't drive it home and must have it towed. Then your breakdown service refuses to tow you as you haven't broken down but have committed on offence! Then the day really sucks.
So if you have a JDM bumper and don't live in a state where they make plates that fit i'd suggest you make some brackets to sit behind the plates so they can be nice and flat and seen by our friendly authorities. As I always go on about, keep your car nice and compliant with road regs, give the ticket writers less to write about for when that day does come - like I kept saying to a member here "Get rid of those blue LED's - you'll get fined" (he did eventually - fined, not rid of them…) some absolute traffic nazi goes all Rommel on your car...