No. Given the rather odd and not - so - common naming, it's highly unlikely to be a popular fanfic. Popular fanfics usually have more accessible and mainstream - friendly names.
Most likely not. A title like 'percy destroys tiny cunt fanfic' is not the kind of thing that would appeal to a wide audience. Popular fanfics tend to have names that are more in line with the general themes of the source material and are more easily understood. This title seems very specific and perhaps a bit off - putting to the general public, so it's not likely to be popular.
I don't think it is. The name itself is rather unusual and not something that would draw in a large number of readers. Popular fanfics usually have titles that are catchy in a more conventional sense, related to the characters or the main plot in an obvious way. This title seems to be very niche and might only be relevant to a very small group of fans who are into something very specific, so it's not a popular fanfic.
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