The place where I’d look for official links is here - Links – Lubuntu
You’ll note, both of the links you provided are there.
FYI: I’m not a developer, but if I have questions; I usually use IRC, and if away from my primary PC and thus don’t have an IRC client handy; I usually opt for telegram.
If it’s bug reports, or feature requests, using this site is appropriate, or reporting via bug reports even better. Bug reports being the easiest to track.