I can’t speak for IPS, but it’s still safe to say that this is extremely unlikely.
The people with coding skills don’t need it. They can just open the respective page, inspect the actual HTML and learn everything they need from it. It’s all public and there for everyone to see.
The people who don’t have these skills, can’t do much with such a tutorial. They would just have to copy code they don’t understand. If they make the slightest mistake, everything breaks and now someone has to give free support for the tutorial. Who is willing to do that? If the user wants just a tiny variation of the template, they would have no idea how to do it. So again, they would ask for free support. Not to mention that such custom Pages templates correspond to Pages database fields and possibly CSS and JS files. If they don’t exist as expected, again, everything breaks. It just doesn’t work. I’ve created an entire online course around learning Pages, but it does not contain teaching people how to create templates from scratch. That’s just not a suitable topic for a tutorial. Either you know how to do it or you can get stock or custom products which deliver the needed functionality. There really is no middle ground.