I'm still not sure that those dimensions are right.
My SACA member handbook 2 summers ago said it was 190.2 x 130.2 fence-to-fence
Take space for between the boundary and the fence (5m wing, 8m behind the goals) and I'd be expecting a playing field approx 175 x 120m. Pretty much the same a Subiaco.
Watching the redevelopment, and with the knowledge that the finished oval is supposed to retain things like the approximate size the ground has always had (curving of the western boundary during the redevelopment of that side of the ground not withstanding), I'd be very surprised if they cut 30m off the size of the oval, or had the goals in that far from the fence. Remember the AFL match there end of 2011 - goals a "normal" distance from the fence.
It is doubtful that they would state dimensions of the AFL playing field seeing this is a footy and cricket oval. You could expect dimensions for AFL of 157 x 113.