Bananas are a mono-crop. There was a disease in the latter half of the 20th century that threatened all bananas on the planet. A particular strain survived. This strain is what you NOW think of as a banana. The candy tastes the way bananas used to taste.
counterpoint: youtu.be/I9ZtvpBoXzI
TL;DW banana candy does not taste like cavendish either

I Ate the Extinct Banana (so you don't have to)
YouTubeHe did find that the artificial banana flavor tastes the way gros michel bananas smell when they’re very ripe, though. So I don’t think it’s wrong to say the flavor is based on the gros michel rather than the cavendish, it’s just that flavor is a really complex equation and artificial flavors tend to fail to capture the totality of the experience.
Yeah it’s only with grapes that they really captured the best part