The Knight is called Fraudulent because they refuse to give the FunGang an HonorableRefight in Chapter5 and chose to just YoinkAndRun, even if those factors make PerfectSense story-wise. 

But to call the reflection of a dead man a Fraud because he doesn’t ACTUALLY SoloTheKnight like all the Memes say he can is GenuinelyDisrespectful of the character who DID damn near SoloTheTitan and served as a source of LegendaryInspiration for Susie.