Sub-Planckian inflation & large tensor to scalar ratio with $r\geq 0.1$

We categorically point out why the analysis of arXiv:1404.1821 [hep-ph] is incorrect. Here we explicitly show why the sub-Planckian field excursion of the inflaton field can yield large observable tensor-to-scalar ratio, which satisfies both Planck and BICEP constraints.
Comment: 6 pages, 1 figure, Comment on arXiv:1404.1821 [hep-ph]. Computational error corrected in Eq(7). But conclusion remains unchanged as it completely nullifies the added claim of arXiv:1404.1821 [hep-ph]