5 or 6 years ago, only about 95% of the coins announced were shitcoins or outright scamcoins.
You are right. Now the number is very close to 100%, sadly.
Now it is impossible to even find something worth investigating.
I find it better to spend that time doing something else that one might have interest in, buying more bitcoin or just spending more time with family. Either way if you keep hunting coins worth investing in, you will end up with the same result.
Is there some forum somewhere that is (a bit) moderated that may filter out some of these obvious shitcoins/scamcoins?
This is one of the bad effects of democracy/free-speech that is allowed in this forum. You have to be the judge of whether a project is a scam or not. You are responsible for your money and nobody will baby-sit you for that.
Still some outright scams get called out in the "scam accusations" section of this forum. Even if the project that you are looking for is not there, you can very well be sure it to be shady at the very least, if not scam - why? Because the altcoin market is like that only.