Even though the majority of members that doesn't see this message in the first place wouldn't check up much closer on the surroundings anyways it is not a bad idea trying to highlight this a bit more no doubt.
Though I'm afraid this is not enough, the only thing that truly would be would be doing something like we did back in January this year when we wanted to inform the players of the new rules we were going to enforce which was to take down the game server for a whole week and posting big letters at the game server player counter advising users to check out a certain thread.
However, we will gladly add a notice to the news banner for the upcoming days, but I'm very certain most of the things we'd try the regular way wouldn't be enough to ensure everyone got the message. Will try to sort something out non the less.
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Regarding the not being able to see the posts, this is not the case, I tried this myself on another browser which I'm not even logged in on and this displayed the forum just fine, and I know my laptop usually does this as well. You should probably get that checked up cause the forum is open for anyone, the thing you cannot do as a guest is posting in the threads. But if there's continued issues for you this wouldn't be the place to keep that conversation going and it should be issues on your side, not the forum xD