Take this article with a grain of salt. Their description of Singlish is enough to disqualify the accuracy of the rest of the piece. Singlish is not a unique or separate langauage, or even an actual language. Comparing Singlish to English is no different than comparing Cockney to English. I don't think the different dialects of English within the U.K. are all considered separate languages, and therefore Singlish should not be either. An American English speaker will likely have much better chance of understanding a Singaporean than understanding some of the U.K. dialects.