Did this competition also include Basic Skills or Aspire events for kids? Those events would also have been judged using the 6.0 judging system and not IJS. It is entirely within the rules to use the 6.0 system at these levels, as well as Adult Beginner and Adult High Beginner.
(For Adult Bronze and even Pre-Bronze, and for Pre-Preliminary, Preliminary, and Pre-Juvenile well-balanced and Excel tracks for kids, some competitions use 6.0 and some use IJS. It's up to the host club and the chief referee which judging system to use for those levels, depending on the amount of ice time and officials available. 6.0 events are much cheaper to run and therefore usually have lower entry fees.
There are some Excel levels that must use IJS if they are part of the Excel Series, which is in progress this time of year so chances are a recent competition was part of the series.)
The rules for 6.0 judging are much more flexible than for IJS. Basically the judges should look at the quality of the skating first, then at the difficulty and quality of the elements attempted, and then take deductions for falls, time violations, and elements not allowed at that level. If a skater started out with higher scores before any such deductions, they might still end up ahead of other skaters even after the deduction.
The problem with 6.0 scoring from a spectator's (or skater's/coach's) perspective is that the details of the judges' thought processes don't get reported in the scoring -- usually all that's posted is the ordinals. So there's no way to know what each judge gave credit for or what deductions they took.
As an Adult Bronze skater, I was frustrated that I had to give up freestyle competition before it became common to offer IJS at that level, so I never got that detailed feedback.
Also, judges assigned to those competitions are often less experienced than judges assigned to IJS events. It's part of the process of learning how to judge.
If you are a USFS member and you are over 16, perhaps you would like to get started on that process yourself. In which case you would start by judging low levels using the 6.0 judging system.