The command you're looking for is sv_mute_players_with_social_penalties 0
, unless it doesn't work. The command by default is flagged as FCVAR_DEVELOPMENTONLY so you will need to use something like sm_cvar to toggle it off.
However, I do have a question regarding m_bHasCommunicationAbuseMute. How does one receive the values for each player? Would it just be something like...
int PlayerResource = GetPlayerResourceEntity();
int PlayerIsAbusive = GetEntProp(PlayerResource, Prop_Send, "m_bHasCommunicationAbuseMute", _, Player);
Hard to test because I don't have anyone I know personally who's flagged and because I am not at all familiar with the way this works.