No, that claim is not true.
Looking closely at the second panel of the comic:
- The police officer’s right shoulder (from the character’s perspective, or the far-right side of the panel from the viewer’s) is just a normal rounded shoulder in the blue uniform, with the usual simple Stonetoss linework and no distinctive Among Us/crewmate (“amogus”) silhouette, visor, backpack, or similar shape.
- The only dark/black elements near the officer are the holster/radio/equipment on the hip/side and the handcuff area (with the “CLICK!”), none of which form a clear amogus figure on the shoulder.
This is almost certainly pareidolia (seeing a familiar shape in random details), which is common with the amogus meme. Stonetoss has previously stated he does not hide amogus in his comics. There is no such detail present in the right shoulder of the officer.