I think the reason why they say that gambling can be relaxing is due to that dopamine fix problem gamblers get when they spin a slot or spin the wheel at a roulette table. In this context, "relaxing" might be confused with "soothing" in the sense that the addict is scratching an itch. One thing I'd like to point out is that many of the symptoms from the OP are also common among gamers. The line between gambling and gaming has become incredibly blurred. https://www.nodepositdaily.com/features/differences-between-gambling-and-gaming/ has a cool piece on this phenomenon, but essentially the two are overlapping. It doesn't help that many games have paid loot boxes, which are nothing more than single reel slot machines.

I guess my point is that problem gambling symptoms will become extremely common among gamers as well. To me, that's a far larger issue, since the number of people playing video games far exceeds those who are gambling. Figuring out how to help such individuals should be a priority for all gambling regulators.