Dear Hou Yau,
it must be clear the my theory is purely 4D. There are not real extra-dimensions, thought the theory inherits the mathematical beauty of extra dimensional theories 1110.0316. I have worked actively on my theory since 2004 and the first official track, containing all the aspects of the theory, is 2005. The analogies of some ideas (though not fully consistently developed) of your paper should deserve a citation to my works .
I try to answer to your questions
1) A cyclic variable is something that start at a particular point and travel "forward" to the same point after one cycle.
2) A cyclic variable can be represented as a compact variable with periodic boundary conditions in order to identify the ends points.
3) The manifestation of a cyclic time is quantum mechanics in all its aspects, see my papers.
4) In my theory there are no extra dimensions. The analogous of the Kaluza miracle in my theory is the fact that particular local isomorphisms generate gauge interactions as diffeomorphisms generate gravitational interaction in general relativity.
Thank you.
Donatello