Interesting... the link on YouTube takes me to the front page of Learn Substance 3D here: https://creativecloud.adobe.com/cc/learn/app/substance-3d
I also arrive there when trying links I saved a couple years ago, such as https://substance3d.adobe.com/tutorials/courses/Getting-Started-with-Substance-3D-Painter-2021/youtube--ZbmRsOnApk
Does that link work for you? Could I have some strange problem on my end?
The links in your post do work for me, thanks for that.
The link under the video indeed bring me to the front page of Learn Substance 3D, but that's where you'll find the dedicated page of the tutorial with all the assets (I should have precised it in my first message). So, don't worry, no problems on your end.
I'll contact the person in charge of these videos, so we can add the link straight to the tutorial instead of the front page of Learn.
Thanks for reporting the issue!