What nonsense, colonizers do not live and settle there for thousand of years. Would you called majority Japanese now a colonizers since the originally come from Korea/China and before them they were people there?
>Singapura had already become "great ruins" according to Alfonso de Albuquerque.
Albuquerque was the first European colonial who conquered Malacca in the early 16th CE, later Dutch and then British. They all came because they wanted to bypass what they considered "trading bottleneck" created by Ottoman, the most powerful maritime empire in the Mediterranean and Europe for many centuries.
The local authorities most probably very well deployed a typical scorched-earth strategy to prevent the Albuquerque to fully utilize Singapore infrastructure. The British did exactly this to most part of Singapore including totally damaging the very important causeway when the were defeated by Japanese in the mid 20th CE. Fun facts, the world busiest causeway still not return to the its original sophisticated design with elegant pass-thru water design until today, thus pollution side effect are still happening and not being solved [2].
[1] Scorched earth:
https://en.wikipedia.org/wiki/Scorched_earth
[2] Why Singaporeans Are Fleeing to Malaysia Every Weekend | AB Explained [video]: