Some pointers regarding classical bypass surgery (Roux-en-Y) : 
Classic bypass surgery(Roux-en-Y) is a surgical treatment for people who have reflux grade B or higher (that is, people who have reflux grade B or higher on endoscopy and history).
If he has severe reflux disease, other bariatric surgery methods such as gastric sleeve and mini gastric bypass cannot be performed for him, and the operation of choice for these patients is classic bypass.
Can a person with severe reflux have weight loss surgery? A person with severe reflux can only do one type of weight loss surgery, and that is the classic bypass operation.