The 4th one I do not agree with. I know some people who lie about their gambling activities because they don't want to get in trouble either due to their nature of work or to their family. Some are literally just trying to hide their gambling activities even though they play for fun on a handful of occasions or just to kill time and that doesn't mean that they are addicted. The rest of the list, well, it's highly possible that these guys who possess these behavior will turn out as addicts as it point towards one common theme: lack of self-control.
Not many are honest in their gambling activities, let alone to family or friends of co-workers, but that's also not a reason that can be said to be an addict, after all there are two categories of addicts, light addicts and heavy addicts, usually heavy addicts are more difficult to recover because they really don't care about the people around them, let alone advice, so they continue to play gambling spending money.
If I look at most of the lists that are written like light addicts, you can't be called addicts and most people don't want to be honest because they just want to play for fun for themselves and don't want many people to know about their fun activities, but even so, usually light addicts are still can still control themselves, except for heavy addicts.