No, not very helpfull, as "The weight of these factors and how they quantifiable influence popularity is unknown" !!!
And what I see doeesn't really match with what is said.
In my actual games,I didn't make any of these "actions that decrease your popularity"
- starting new wars without declaring them
- when producing a lot of troops while already being unpopular
(what is "a lot" ???!!!)
- having troops in their country without right of way
- getting your spies caught by them
On the contrary I have been attacked by an other players without any previous warning - and even with player I had high diplomatic stance with - and my popularity is much lower than them !
I really don't understand how to manager it, but it's very stupide and boring to be always attacked by IA and being unable to get back to peace with them !!!