I am not surprised at all that they found very little influence on the growth of Candida albicans with a high carbohydrate diet. First of all most of the sugar will be absorbed long before it could reach the colon. Secondly, the biggest factor concerning the growth or inhibition of growth of C. albicans is the pH of the terrain. An alkaline pH from a lack of flora turns on the Candida growth gene as where the acids from the flora turn off the growth gene.
This is why people rarely get their Candida under control with a Candida diet. Unless the diet includes means to build up the flora such as fibers and cultured foods the Candida is not going to be put back under control.
As for the sugars and acid reflux this is pretty common. The most common cause of reflux is a lack of stomach acid leading to fermentation instead of digestion. The fermentation of sugars produces a lot of gas in the stomach putting pressure on the lower esophageal sphincter (LES). When the LES tires out it relaxes and the gas rushes up the esophagus carrying the traces of acid with it.