Will they ever read the literature?

Although the authors of this new JACI paper claim to having done a systematic review they even missed two key papers that even contradict the statement above(1) http://www.jimmunol.org/content/173/5/3432.long

The data suggest that although 1,25(OH)2D3 induced these Th2-type genes, the treatment failed to have any affect on experimental asthma severity. However, VDR-deficient mice failed to develop experimental allergic asthma, suggesting an important role for the vitamin D endocrine system in the generation of Th2-driven inflammation in the lung.

or (2) http://www.ncbi.nlm.nih.gov/pubmed/13679819

Early treatment with vitamin D augmented allergen-induced T-cell proliferation along with T(H)2 cytokine (IL-4 and IL-13) and IgE production.

So save your 31.50 USD that JACI will charge you for the PDF.