That is not true. If you have enough resources you can mine BTC or other crypto. Learning a few steps of how to setup a mining rig is not rocket science. I am sure there are plenty of walkthrough about it in youtube that can be used to follow the process.
Mining does not require much technical knowledge compared to cryptography. I don't see why a beginner should not go into mining if he has the available resources. These days you don't need to know how to do a particular thing just get the idea and hire people who will make it happen. What is important is finance and if a beginner has the capacity and financial strength then nothing should stop him from mining.
There is no need to use YouTube because mining tools for operation can be very expensive it is wrong if you go about practicing with those tools all alone while watching YouTube tutorials. When you encounter a problem, or something gets damaged along the line. I think the best thing to do is hire someone with the experience to teach you for some time and when you get acquainted to it then you can start running the process alone.