The trouble with a lot of these modern attempts, in my opinion, is they get too hung up on the word "wonders," as if each entry on the list needs to have some otherworldly or unbelievable quality to it in order to qualify.
But that's the exact qualification that was taken into account. The *exact* qualification. Seven man-made creations that seemed beyond the capabilities of man to create at the time.
In reality, the original list was basically just a list of must-see tourist destinations of the time.
No they weren't. Most of them didn't even exist any longer (some by centuries) when the original list was created during the Renaissance.