I’ve been going over the video and studying the picture you provided. You seem to have everything match the lesson. The only thing that I can think of is the orc’s scale may not be applied. Sometimes textures do nothing when the scale isn’t 1. However I’m not confident in this solution because during sculpting, blender mentions if something isn’t uniform scale. Usually in blender when something like this happens it’s a very small that is overlooked like a box that needs to be checked.
Another thing I do sometimes when the texture isn’t working, is I’ll recreate the scenario of making the the same texture ( as new material) again. Sometime I click or turn off something I wasn’t supposed to.
Let me know if any of this doesn’t solve the issue, and I’ll try to think of more solutions.