Today, I do a heart healthy diet, and try to fast from 8PM-12PM (eat between 12PM-8PM). This helps me not eat/snack unhealthily in a condensed period of time.
And high cholesterol in and off itself is not problematic, if your other stats are in line. E.g. high cholesterol can be a pointer to other problems, but it itself is not considered dangerous.
So did a lot of other people, some of whom were in good shape went on keto, and needed a bypass after not too long.
Total cholesterol isn't necessarily that predictive but non-LDL cholesterol/APOB are strong predictors of CVD
That said, cholesterol is essential for the production of bile which breaks down foods. Late night foods probably equates to excess cholesterol released to break down said foods and higher cholesterol levels.
We probably want to have periods of fasting in order to not produce excess cholesterol.
So maybe the person fasting had higher cholesterol levels due to his body needing more bile immediately to breakdown a larger amount of food at once? I am very much not a doctor or at all educated in these topics.