How to change windows 10 32bit to 64bit?

Solution
No, that tutorial you linked is 100% real.

It clearly says in the first part that you need to reinstall Windows - "If you have 32-bit already installed you will need to do a clean install of 64-bit."

The second half tell you how to go about reinstalling Windows.
No, that tutorial you linked is 100% real.

It clearly says in the first part that you need to reinstall Windows - "If you have 32-bit already installed you will need to do a clean install of 64-bit."

The second half tell you how to go about reinstalling Windows.
 
Solution
Step 7 of that tutorial is Install 64-bit Windows 10. The tutorial I linked to shows how to do that. That tutorial is just a long winded version of you need a clean install of a 64-bit os. Ii just shows you how yo check that your cpu is 64-bit ready.