Kinematic cosmology in conformally flat spacetime

In a recent series of papers, G. Endean has examined the properties of spatially homogeneous and isotropic (FLRW) cosmological models filled with dust in the conformally flat spacetime presentation of cosmology (CFS cosmology). Endean claims that it is possible to resolve some of the difficulties exhibited by the standard model when confronted with observations if the theoretical predictions are obtained in the special framework of CFS cosmology. As a by-product of his analysis, Endean claims that no initial (big bang) or final (big crunch) singularities occur in the closed FLRW model. In this paper, we show that the arguments leading to Endean's conclusions are incorrect, and we reject his CFS cosmology.