I like the paper. Nevertheless, I have some "naïve" doubts about the allocentric problem. My main doubt is if it is a cortex duty to solve this problem. In some way this is a input issue: you have to transform the sensory information in some form of invariant.
Although you briefly cite the auditory cortex in the paper, there is no "deeper" explanation about what allocentric means in that context. Presumably, the task should be to cancel internal noises, integrate the head position, etc... to transform auditory nerve signal in an invariant. I think, It is suspected that the DCN (Dorsal cochlear nucleus) [part of the cochlear nucleus which is located into the brain-steam] might be doing that . DCN is very similar to cerebellum (purkinje + parallel fibers+ fusiform cells). DCN is receiving inputs from the cochlea, the vestibular system, cortex, etc... to actually produce the input to the auditory cortex (note that DCN is not well understood in humans).
My understanding is that Cerebellum is doing something similar (integrate body position, precortex-motor commands, other sensory information,...) Cerebellum affects not only body coordination but many high cognitive functions .
Perhaps that entorhinal cortex is too far away from the "input ports" to be a effective solution to solve this. The brain steam nuclei + Cerebellum might be playing a key role in this problem.
 D. Oertel and E. D. Young, “What’s a cerebellar circuit doing in the auditory system?,” Trends Neurosci., vol. 27, no. 2, pp. 104–110, 2004.
 S. Singla, C. Dempsey, A. G. Enikolopov, R. Warren, and N. B. Sawtell, “A cerebellum-like circuit in the auditory system cancels responses to self-generated sounds,” Nat. Publ. Gr., no. August 2016, 2017.
 M. Ito, “Control of mental activities by internal models in the cerebellum,” Nat. Rev. Neurosci., vol. 9, no. 4, pp. 304–313, 2008.