You need adequate calorie intake to avoid starvation mode. You don't need to get those calories from sugar.
When you intermittently fast is the following conclusion true:
Adequate sugar intake = body is not in starvation mode = break down fat because no need to store them?
You need adequate calorie intake to avoid starvation mode. You don't need to get those calories from sugar.
Total calories matter more than sugar intake.
TL;DR: no, that correlation is not true.
I encourage you everyone who talks about "starvation mode" to go research Fact vs Fiction of adaptive thermogenesis, ideally from reputable sources and not social influencer accounts.
There's a lot of myths regarding adaptive thermogenesis but, in simplest terms, it effects how you feel and not how you lose weight.
In short it decreases NEAT (non-exercise activity thermogenesis), increases appetite and influences hormonal (hangry) mood swings.
Your TDEE does not change based on what you eat or when your eat.
As it's almost midnight, I'll leave the rest as an exercise for the reader but in a single sentence.
There is no such thing as starvation mode. This is just bro-science.