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For UV to be effective (as for a steripen) the water needs to be clear for the light to fully penetrate. So either the water will need to be good quality in most respects in the first place (described as household quality in the article linked to above), or you will need to filter it. So why not just filter it to a safe level in the first place?
Leaving it in the sun afterwards wouldn't hurt if you are closeish to the equator, and, from an aid agencies point of view it is cheap, simple and may help to a varying extent with an otherwise unsafe watersource in the absence of proper water treatment if there is no other option only. Even then some form of rudimentary filtration may be possible from local materials and might make a big difference to the effectiveness. In combination with other treatment methods it does have a place where appropriate.
It won't make it safe unless it is fully clear first!
But advising total reliance on sunlight with no further provisos is foolish, wrong and dangerous.
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