My understanding is that Malaysia is eligible and that the Singapore Chess Federation is actively promoting it to their players. The dates on the title of the invitation letter are clearly a typo and the event is indeed being held from 4-11 August 2016. I also believe that the previous successful event being referred to is actually the Asian Youth Championships 2015 which was in Suwon. For full details, please click on the link below for prospectus: https://www.fide.com/images/stories/FIDE_Calendar_2016/East_Asian_Youth_Chess_Championship_-_Regulations.pdf