This does not "cancel" the Muhaddithun; rather, it shows the depth of ijtihad (independent reasoning). The page reminds us that:
The Prophet opened his hand to reveal a mound of red soil inside the jar. He spoke in a voice heavy with emotion: "Jibreel (Gabriel) has just come to me. He told me that my grandson, Hussain, will be slaughtered in a land called ". al-hakim al-mustadrak vol. 4 p. 398
: Angel Gabriel informed the Prophet (ﷺ) that his grandson, Hussain, would be martyred in a land called Karbala . Gabriel then presented him with red soil from that location. The Sign for Umm Salama This does not "cancel" the Muhaddithun; rather, it