I disagree and think the FAQ and Article disagree :p
In a situation where a turn is illegal during certain times of the day (e.g. No Left Turn, 7-10 am, 3-7 pm, Weekdays), it's generally best to err on the side of caution and restrict the turn. This way, waze will never instruct a driver to make a turn when it is illegal (typically during rush-hour traffic, the worst-possible time to create driver confusion).
FAQ:If the turns are allowed during the majority of a day or week, leave it open, but also consider volume and if most of the weekly traffic would be restricted from turning there, then set the turn as restricted.
While they say the same thing if you consider the time the turn is restricted to be "most of the weekly traffic" then they do agree, but I think that is a bit ambiguous even for an FAQ. My suggestion, if the article is still theoretically the standard at least, would be to simply paste the first paragraph (Waze currently has no provision [...]create driver confusion)
as the FAQ answer and then link for the more detailed info.