There’s a few things worth considering here.
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SIS Go electrolyte and SIS electrolyte tabs are different. The “Go” products do indeed contain carbs
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More carbs is generally better (see caveat in number 4), especially if you feel depleted of energy mid ride. Carbs are also said to help lower RPE which means you can go harder or suffer less for the same effort
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There’s more to a gel than just it’s carb content. Flavour, texture etc are all important and if a gel tastes so disgusting that you don’t enjoy it, then it doesn’t matter how much carbs it has in it. Note also that SIS do isotonic gels. I don’t know the science but they’re basically designed to be consumed without the need for additional water, unlike a lot of other gels.
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The amount of carbs that people can tolerate differs. That’s why the portable toilets are always full in the morning before a ride. People took on a lot of extra carbs that they wouldnt normally eat, and it upsets their stomach! So it is possible to have too much carbs, depending on your tolerance