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When is a base actually overhanging terrain and when is it not?
Alot of terrain features have details that can be considered to be gaps and/or depressions making it impossible to fit 100% of a base flat against it.

If the rim of a base can comfortably sit 100% flush ontop of a terrain feature but there is either a depression or detail in the terrain making it so a part of the whole areal of the base is not flush is that overhanging?
if yes where is the line drawn? Terrain details of more than 1,2,3,4,5mm in depth? 1" in depth? is a small missing piece of concrete in the floor of a ruined floor level enough to stop anything from being placed over said hole even if 100% of the rim is touching the floor?.
If no would a fair assesment be that the rule should be interpreted more along the lines of "rim of the base" instead of simply "base" and/or overhang being interpreted as to mean "sticking out, outside of" instead of the dual meaning of the word where "suspended over" could be applicable?.

(For context, Redemptor dreadnought stands on a piece of terrain with a terrain detail in the form of a depression, the base is easily large enough to absolutely cover the entire detail and be placed flush against the terrain barring the detail under a smaller part of the base that is not the rim)

This is a place where common sense must be used. If the model is sitting pretty much flat on the terrain without any significant overhang, then it is all good. Your Redemptor dreadnought example is fine, barring a visual that changes my understanding of what you are describing.