hmm I think -6 does break the record for lowest score all time (previous record was -5). Also -4 ties the record for lowest team batting score of all time.
if you're looking in the record sheet that is way outdated.
Lowest Batting Score Wonder Crew 7/6/2016 -6
Lowest Total Score Broadway 7/10/2011 -5 (this one is trickier because the scoring was so different with pitching. I can certainly take this one but there should definitely be a before negative pitching and after because -5 with the pitching we had is a lot tougher to do)