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OK, I have learned some things through research about various GNSS types. I didn't find any of this in the ROS documentation, but it matches the field names.

No Fix means that it can't find a location.

Fix means that it found a location, using solely GPS/GLONASS/etc.

Fix with ground-based augmentation means fix with assistance of such networks as DGPS or GBAS.

Fix with satellite-based augmentation means fix with assistance of such networks as StarFire. These systems work like ground-based augmentation, but with satellites.

It appears that with improvements to GNSS systems and the end of selective availability that these systems are used less now, which is why my initial research didn't come up with this.