Perhaps there's something else in play in your scenario, but for most people closing Waze will stop it from running in the background as well. And certainly goes for most other apps, as we've certainly seen demonstrated by many in relation to Facebook, for example, in various threads where its background process has been discussed and that closing the app would stop it.
We can also look at yet another article about multitasking at http://appinstructor.com/blog/2014/background-app-refresh-explained that has excerpts from Apple's own support information about it all, which, in part, mention the following:
"If you force an app to quit by dragging it up from the multitasking display, it won't be able to do its background activities, such as tracking location or responding to VoIP calls, until you relaunch the app. "
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https://support.apple.com/en-us/HT201330
Nothing usual about my situation, though we know from the Facebook app that developers sometimes try to game the system. Perhaps that was the case with Waze, and it's different now, I really don't know. All I know is what happened and that I wasn't interested in using Waze after I discovered what it was doing in the background.
The article you cite isn't particularly helpful in that it refers to forcing an app to "quit," and then cites as a reference Apple's support information that uses the terminology of forcing an app to "close" (in the case of it becoming unresponsive). Apple is perhaps oversimplifying the issue somewhat by using this language instead of speaking more technically about iOS app states.
Anyway, I wasn't planning on becoming anywhere close to this engaged in this discussion interesting though it may be. The main takeaway that I hope everyone gets from it is that users will only rarely have any reason to delete saved suspended states. It's a useful thing to know about I suppose but it is not a maintenance method or requirement of iOS. Let your device do this work for you, and be happier and more productive. And that's all I have left to say about it.