The link gives a numbered step-by-step to turn off Controlled Folder Access; in my opinion, the best course of action instead is found in the final paragraph:
“Occasionally, an app that is safe to use will be identified as harmful. This happens because Microsoft wants to keep you safe and will sometimes err on the side of caution; however, this might interfere with how you normally use your PC. You can add an app to the list of safe or allowed apps to prevent them from being blocked.”
Thus, add Shotcut to the Safe Apps list.