The story sucks to be honest. First of all because of the percentage you mention, but is there that much difference between $5,000 and $27,000? If he had said that $5,000 got him $500,000, it would seem to me to be a considerable difference.
And besides, it was the only way he could get that $22,000 difference? I don't know, maybe taking a loan to invest in his company would have made more sense.
Maybe the meaning of the story is that he took a risk in the casino and won, it gave him the courage to continue to take risks in business - instead of a reliable bankruptcy after which he would still have a lot of capital, he decided to keep the business to the very end and eventually won the jackpot. In general, it is rather silly to confuse gambling with business, but sometimes such comparisons really make sense because in business there are many external factors that are beyond our control and can be perceived as random.
Maybe he had given up on what happened with all his money so he decided to gamble.
And unexpectedly, he was finally able to win a lot in a week and was finally able to help him to continue his business even though the money was still lacking.
No one thought that his fate would change and that he could get the luck that came at the right time so this is what is called the right person at the right time to get lucky.