Yes and no
Dark chocolate has a substantial fat content
Really dark chocolate (the listed category maxes out at 85% but darker is widely available) has much more fat than sugar

During my transition from keto to animal based to carnivore, I stopped eating dark chocolate because of the oxolate toxicity (I started getting rashes whenever I ate chocolate) rather than because of the sugar

https://tools.myfooddata.com/nutrition-facts/170273/wt1/1