Petition to the Govt on the Elected President Election

Here is the link to the petition. https://www.change.org/p/in-support-of-an-open-singapore-presidential-election-2017
Lim Tean, Secretary General of NSP, Tan Kin Lian, Goh Meng Seng and Syafarin Sarif have started this petition to the Govt stating that the next EP election should be in 2023 and not in 2017.  The issue is how the 5 terms were counted, the govt starts counting from Wee Kim Wee but