Perhaps, then, it'd be most accurate to say that any such declaration where the idea was that of someone other than a gambler would have been a good one.
It's interesting that that game was never fixed in the classic manner. The person responsible, Marlon Aronstram, planned to beat the bookmakers. Normally, it's the bookmakers who get involved to try and beat the punters.
Cronje, in short, was interested not in breathing life into the game, but getting a result. Which meant that a South African victory was the best outcome for him, an England victory the second. And to ensure against the draw, he, er, cunningly brought himself on just when it looked like England were going to shut-up shop.