Do you mean that consuming a daily dose of olive oil that would correspond to the dose that some people here are reporting photoprotection from, i.e. about a teaspoon of oil, would provide a noticeable level of photoprotection? Based on my experience, that doesn't happen.
The stories here are vague and hit-and-miss. I've been taking a tablespoon of late and noticed a good deal more oil on my skin. Some have reported zits, which would also be the result of more oil. And some are taking a lot more than a tablespoon. So yeah, on average I'd expect some extra UV protection from the oil alone, but not much and not very consistently.
These days I try to get two tablespoons of good EVOO daily. I can't say that I notice much difference in skin oil. I wouldn't say that the reports of photoprotection were vague. They seem pretty clear cut. It's not a 100% protection, but it sounds like it's pretty good.
By vague I mean statements like, my roommate hasn't burned either, with no details or sometimes not even a first person report. I've noticed two people who claimed not to get a sunburn while taking it but gave no specifics on their sun exposure. While others have reported no such effect or a negative effect--ie, they got sunburned. It's all quite vague.