No, it's literally impossible to Gish gallop with text -- readers take in texts at their own pace, they can re-read sections until they fully understand what authors are trying to express, they can stop reading texts and fact-check authors at any time, they can choose to stop reading texts whenever they feel confused or overwhelmed. Text-based debates (or conversations in this case) neutralize all the rhetorical tricks of the Gish gallop. Stop carrying water for genocide enthusiasts.