Actually looks like a genuine anomaly of a result as opposed to anything more nefarious.
I'd like to think I can speak with a fair degree of knowledge/confidence in all manners of pool-rorting, div manipulation and even "O/S betting participants".
The progression (and relevant pattern) of pool sizes means nothing is really standing out here.
R5: W - 16.4k, P - 6.5k
R6: W - 29.9k, P - 11.7k
R7: W - 41.2k, P - 12.6k
R8: W - 45.1k, P - 13.0k
There is no +$5k / +$10k smoking gun jump in pool size here, the ratios between W/P are all within the realms of normal.
The Place div does stick out, but the approx's do not show any/all/a number of runners that have been crushed to enable this, nor does the pool size jump.
Either 'fat fingers' got lucky in the Win pool, or an All-Up for mine. A definite head-scratcher though, that both results were up/down the same runner.