That engine list is about driver-pleasing performance, not reliability. It states "The selection takes into account power and torque output, noise, vibration and harshness (NVH) levels, technical relevance, and basic comparative numbers."

Which engine(s) that have made Ward's do you have an issue with, from a reliability perspective?

I'd suggest the Cadillac Northstar would be on that list - they pretty regularly need a rear end seal at around 100k, which is something that requires removing the entire engine.

Conversely, there are many engines on there noted for their reliability, Ford Modular V8, for example, GM LS1, Ford Model T engine, VW Air-cooled Engine.