Depends on the type. If it is an experienced, not spammer bounty hunter, then yes, that person can have a great feeling on investments.
But that does not mean that an investor cannot have deeper insights, or can judge better from the same information.
However, I feel that if you are translating, you are essentially understanding and translating the whole whitepaper, making it possibly the best form to understand the whitepaper. And you can extract various information about how it's written, what is emphasized, how its phrased, the effort put into it, etc.
While investors usually don't go so deep, but their reviewings cover much more projects at the same time, essentially making their readings more effective. So its hard to judge, because if an experienced investor put plenty of time into evaluating a single project, may understand it deeper and judge it better than a bounty hunter .