This is the 8158th most frequent Russian word.
литцау
The word "литцау" does not exist in Russian.
In this sentence, 'литцау' is used as a proper noun, likely a person's name designated for someone who assisted another.
Литцау помогал своему другу с домашним заданием.
Litsau helped his friend with homework.
Here, 'литцау' appears to metaphorically describe someone taking on the role of a leader or representative for a group.
На встрече, литцау представлял интересы местной общины.
At the meeting, litsau represented the interests of the local community.
In this context, 'литцау' is again referred to as a proper noun, indicating familiarity with the individual by the speaker and audience.