They only analyzed what the author of the post wrote (the caption) and not the comments
While nausea, vomiting, and diarrhea are the most commonly reported gastrointestinal adverse effects with GLP-1-based therapies (occurring in 15-40% of patients depending on the agent and dose), FDA prescribing information for several of these medications does list dyspepsia (indigestion) and, in some cases, gastroesophageal reflux disease (GERD) as reported adverse reactions
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Wootten D, Reynolds CA, Smith KJ et al (2016) The extracellular surface of the GLP-1 receptor is a molecular trigger for biased agonism