Conspiracy theory ?

No
It was business as usual, a sting, happens all the time,
just don't know when though.

If you use the same formula as they use to get the 27%, and play around
with numbers, the obvious will appear.
In this case, why are the 3 runners that won, in negative value ?
It does not matter what comparative markets are used, but it seems there is a "hidden code" between the corporates.

I've seen this happen at the races a few times, one bookie will push the price up so another bookie does the same, yet on screen a plunge just occurred on the same runner, it gets pushed up to 10/1 while the deceptive favs are being bet on.
Well, it wasn't really a deception, it was a case of track conditions at the time, common sense prevailed, the outside barrier was clearer than the mud patch. Opportunity for some, make or break for others.