I can assure you Ptolemy never been to India let alone Singapore.
But hey you just deleted your Ptolemy narrative, are you misleading a narrative?
Ironically although Ptolemy never been to Singapore it's apparently recorded in his book as Sabana [1]. Perhaps that the reason you deleted your Ptolemy entry.
It's also recorded in ancient Chinese record in the 3rd CE Chinese traveller's record describing an island at the same location called Pú Luó Zhōng a transcription of Singapore's early Malay name Pulau Ujong, literally meaning Tip End Island because it's located at the southern most tip of Malaysian Peninsular.
The famous Indian Emperor Chola also said to briefly conquer Singapore/Temasek in the 11th CE [1].
Singapore by any definition for the past two thousands years was not an obscure fishing village. It's always has been a bustling metropolitan with international entreport status. Anyone who said otherwise is lying through their teeth and pushing their own wicked narrative.
[1] Early history of Singapore:
As to your other point, again, you’re overlooking that places change over time. The Arabs built a huge civilization a thousand years ago. But by the 19th century, there wasn’t much left.
What was the population of what is now Singapore when Raffles landed there? Wikipedia says that under the Sultanate the population was under 1,000. https://en.wikipedia.org/wiki/History_of_Singapore
Not much change for Singapore, I know this because I learnt my history and geography properly, I hope you too.
Strait of Malacca has always been the busiest maritime trade route in the world continously since recorded history even until now, and at the heart of it is Singapore Strait where Singapore or Temasek is located.
Even until now most of the world's trade are performed via maritime route even with advent of aircraft, and guess what most of these trades when through Malacca and Singapore Straits. Maritime industry called these Straits the world's busiest trading choke-point. I'm not even exxagerating to say that Strait of Hormuz is nothing compared to this chokepoint, especially in the ancient time.
On top of that, more than quarter of the world's population since recorded history are living in China and India, and in between these two most populous nations are connected via maritime sea route through Straits of Malacca and Singapore.
In the old days, or most of our maritime trading history for thousand of years, we do not have engine for ships neither steam nor fuel, only for very short period recently starting from late 19th CE [1].
During most of our maritime history we use sails. People or sailors travelling between India and China, and returning back rely entirely on wind power that are based on alternate monsoon seasons. This where we got the famous saying of "time and tide wait for no man".
For one season (half a year) they used for travelling westward and another half season they travelling eastward. Either way, ancient sailors from Europe/India/China/Arab/Japan they need to stop over somewhere (read Malay Peninsular or Singapore/Temasek) while waiting for monsoon to change before returning back home. Since Singapore/Temasek at the end of this Peninsular, it's the most natural transit point for these ancient/modern sailors. Whenever you fly over Singapore take a look down to see these multitude of these ships. Although now in theory they don't need to stop for monsoon due to fuel, but realistically the ships still need for refuel/rest/transit/etc.
[1] From Sails to Steam Power:
https://www.marinmuseum.se/en/visit/exhibitions/from-sails-t...