That's terrible advice.Have you done any days for your farm work? The 2nd yr working holiday visa requires 88 days farm work, however from my friend's experience, he applied for the 2nd visa onshore even he didnt actually done the 88 days. And he got it granted.
But it's a big risk that you didnt get the visa and lost your money. or you can try student visa which is a legit way to stay longer in Australia.
It's not only a matter of losing money, lying to immigration has a whole heap of consequences, including a ban from applying for future Australian visas for a set amount of time (3 year ban usually but this is going up to 10 years as of 18th Nov) and even after the 3 years, it could make it harder to get a visa granted.
Also, a refused visa not only affects Australian visas, it would affect any visa for many countries as most countries specifically ask whether you have been refused a visa before.