I didn’t look, but I believe it can. However, that approach is sensitive to what part of the print cycle you look.
Instead, based on reported power consumption here:
and the specs, you can probably count on 2 to 3 hours of runtime before it runs out of juice, if your brownout/blackout were to last that long. At least where I live, that would be a pretty rare event to have a power outage last that long. Maybe once or twice over a 10 year timespan, and coinciding with really bad weather as the trigger, so, in some sense, with adequate warning that it might happen.
One of the higher end computer server blogs did a review of some of the higher capacity lifepo4 power sources, including eccoflow, and how well they performed as a UPS. One of them did quite well. Not 100% sure, but I think it might have been an eccoflow. You might try looking for that report and maybe consider the exact model they tested if you’re considering higher capacity. The one they tested performed even better than its advertised specs.