Asking to oppose or support a flag is not a problem, be it a thread or a PM, as long as it doesn't break other rules - like spamming.
As you pointed above, there is a single thread of asking for supporting or opposing flags. That something good as a community. Community should be stand together to save the community member. I don't know what exactly LFC sent to some users but if he had sent PM to influence the flag, not as he said to look over, that's something not good. Anyway, I don't think a respected user like LFC could be spamming other inbox and try to influence them to oppose the flag.
Why not we make a request to share the PM by Bitcoingirl.club, @sidechain? I think you should PM him to share the PM if you think LFC was trying to censor anything here.
I do not know if LFC is trying to censor anything in here but moves coming from LFC and the other facts are not very good to believe that he said to take a look. He defiantly said to Oppose the flag and said it to some selective friends and dealt in private.
If LFC and some other reputed members are not giving me any value of my words then why Bitcoingirl.club will? May be some of your reputed members can request both LFC and Bitcoingirl.club to share the exact messages.