Ok, I'm a little unsure about this. In the original type description (2007) of Drosera solaris by Fleischmann, Wistuba, and McPherson (doi:10.3372/wi.37.37214), it was described as being endemic to "a small plateau in the Pakaraima Mountains southeast to the famous Mt. Roraima." The holotype description was subsequently given as "Guyana, Pakaraima Mountains, Mt. Yakontipu, just below the summit of the plateau, 2065m". There is at least one European vendor advertising D. solaris from "Mt. Yakontipu, Pakaraima Mountains, Guyana".
On the Wikipedia page on Maringma Tepui (also in the Pakaraima Mountains southeast to Mt. Roraima), the footnote claims that the authors of Sarraceniaceae of South America (2011) say that "Maringma-tepui was incorrectly called 'Mount Yakontipu' by Fleischmann et al. in their description of Drosera solaris." Coincidentally, the book's authors also comprise the entire team that submitted the original description. Unfortunately, I don't have access to the full text of Sarraceniaceae of South America, but perhaps someone here does? I'm 95% sure that the revision is correct, although I'd like to be certain before going around changing plant tags. Thank you to anyone who was willing to trudge through and actually read this whole thing!