If old rainforest ecosystems like these could withstand extinction events (ie. Asteroid impact), wouldnt the fauna living there survive too?
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People are saying birds are dinosaurs, which is true, but what I think you are asking, OP, is is why there aren’t the same dinosaurs even though the forests are there.
The birds that we know today probably didn’t evolve in Borneo, so answers like “Dinosaurs evolved into birds” are wrong because that didn’t happen in Borneo (most likely), it happened elsewhere and birds (dinosaurs) later moved back in.
As to why the original inhabitants aren’t there, it’s likely that the KT event at the end of the cretaceous was so devastating that very few species could survive anywhere on earth. Plants can leave seeds in the ground and regrow later, and burrowing/small animals could hide out and eat seeds and such to survive. Larger species could not survive the devastation because they need more food, most of which was gone.
Some dinosaurs (birds), some mammals, and some reptiles and others survived the extinction, but most of the mammals and dinosaurs (not just dinosaurs!) alive at the time died. What we have now are the descendants of those few survivors, who managed to recolonize the world.
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