You are correct, GlockTalk is not associated with the Glock Corporation at all. It is simply a Glock enthusiasts site.
There is a lot of information available there, but like many firearm specific sites, there are trolls hiding in every nook and cranny, waiting to spook you away.
I have been a member there for many years, and I find today it is probably the forum I visit least often.
Yes genuine 3.5lb Glock Inc connectors are impossible to get now. We used to stock them.
Yeah I thought Eric ran that site out of his own pocket, selling some advertising space, taking “donations” and selling a few items in his store. He does all in addition to having a real-full time job!
The joke is not funny if I have to explain it.
Please do, we don’t speak code here.
Gracious, sir! 
For some reason my G21 feels lighter (weight distribution, my guess) but the smaller package of the G30 is PERFECT for concealed carry. I feel much more comfortable now. The only drawback is the same with the G21, the grip is too wide to utilize the mag release without shifting the grip. Ah, I’ll take that tradeoff though!
Glock caters to shooters, not internet commandos. Glocktalk caters to internet commandos, not shooters. I believe that was his joke.