Lang said: “In this list, ditthi #5 is: “This world does not exist”.What does this ditthi mean?”.
It may sound strange, but people have all sorts of ditthi. The Buddha listed 62 such views in the Brahmajala sutta, I believe.
An example of this wring view is “Solipsism“.
To quote from the above article: “..solipsism holds that knowledge of anything outside one’s own mind is unsure; the external world and other minds cannot be known and might not exist outside the mind.”
By the way, the next line in the 10 types of micca ditthi is, “paralowa does not exist”. This paralowa or the “nether world” is the world of gandhabbas. Even many Theravadins today do not believe that gandhabba concept is correct: “Hidden World of the Gandhabba: Netherworld (Paralowa)“.