It just means if you were to do the same thing but in a company rather then a trust, you would bring in $50,000 as a loan from you into the company.
You can then withdraw that $50,000 whenever you like.
However, the assessable income in the company which is the distributions plus any capital gains on withdrawal of the units from the fund, is taxed in the company at 30% and sits in retained earnings.
You can't just pull these retained earnings out of the company, otherwise div 7a applies. You would have to pay out a dividend or possible a directors fee depending on your circumstances.