Does Fund Investment Guarantees Profit Making?

No, fund investment is just one of the investment methods which is operated by independent traders (also customers of IGOFX) who has higher chances of making profit. Fund Manager shall use their experience, skills, EA, analysis to manage their trading and at the same time increase their chances of making profit, surely there's no 100% guarantee of profit making in every trade they made. 

Fund Manager's previous performance shall not be taken as a long-standing profit making evidence as changes on Forex market is highly unpredictable.