This isn't as simple as other unitframes since the raidframes are dynamically created and shuffled around as needed to facilitate sorting and filters. Also, the handling of the heal prediction and absorb bars are passed to a centralized function that would affect other unitframes using the same template.
If this doesn't bother you, you can try this.
Lua Code:
local oldfunc=CompactUnitFrameUtil_UpdateFillBar;
function CompactUnitFrameUtil_UpdateFillBar(frame,previous,bar,...)
if bar==frame.myHealPrediction or bar==frame.otherHealPrediction then
return previous;
end
return oldfunc(frame,previous,bar,...);
end
hooksecurefunc("CompactUnitFrame_SetUpFrame",function(frame)
frame.myHealPrediction:Hide();
frame.otherHealPrediction:Hide();
end);