This page summarises what each test is about. I found a blog entry introducing the Malware Protection Test, which is an evolved version of their original File Detection Test. That might help in explaining what that test is about but I couldn't find anything similar to explain the Real-World Protection Tests.
= https://www.av-comparatives.org/tests/real-world-protection-test-september-2018-factsheet/ https://www.av-comparatives.org/tests/malware-protection-test-september-2018/
Thanks, it's now clear to me. And there is really no excuse for any of these tools to let the system get comprised. Because it doesn't matter which way malware is delivered.