First of all according to Mansa Musa:
"...Abu Bakr became convinced that he could find the edge of the
Atlantic Ocean,
and outfitted an expedition of 200 ships to find it.
Only one of those ships returned; the captain related that the expedition had come to a "river with a powerful current" in the ocean. The current took most of the fleet away, after which the captain turned back.
According to Musa,
Abu Bakr was undeterred and launched an even larger expedition with himself as the head, departing with 2,000 vessels for his men and a like number for supplies. He left Musa, his vizier, as his deputy during his absence. The expedition was never heard from again, and Musa became the next emperor.
[1][2][3]"
Abu Bakr II - Wikipedia
Abubakir had sent an expedition of 200 ships out in advance. When the captain of that expedition returned; Abubakir then equipped an expedition of 2,000 ships. So Abubakir had some knowledge, even if limited, of the geography of the ocean; because he had sent out a smaller expedition in advance of his own expedition.
Secondly, neither you nor I know what technology was used in these expeditions. How do we know that they didn't lash large canoes together and put a platform on it; sort of like a catamaran?
We don't know. That is why what you are doing is conjecturing just like all of the other sources that you are discounting.