Yeah these are some ridiculously tooled reapers that have Palp and Slicer and Multispectral and LWF and range 3 bonuses and Jam and probably Krennic, etc etc etc.
I've never managed to keep a reaper alive that long. Admittedly, I've not really tried for the full tank reaper, and don't use Palp, but they're mostly pretty spongy.