I think the real reason behind dev1ce's "human limit" is that he finished multiple HLTV's top 3 below s1mple and zywoo, who were considered by Chinese fans aliens or inhuman. During s1mple and zywoo's peaks, a top 3 is the highest a mortal could get, hence the "human limit". So this nickname is both a praise of dev1ce's polished all-around game that elevelated him to the highest level achievable by mortals but also a recognition that there are untouchable realms above him occupied by s1mple and zywoo.