Would you agree this is an infill issue? Pic included

[TTVert]

Basically I accidentally printed a fairly large area (160mm square) with 10% infill. I usually use 20% and never have pillowing but on this one I am. I increased it back to 20% and it still looked ugly although the top layer looked a bit better obviously. I print 4 top/bottom layers usually so perhaps this is hidden but I don't recall seeing this on any of my other prints w/ PLA. Granted most don't have the large flat footprint of this one either. I'm using a filament I've not used in years so perhaps that's part of it but I have the extruder at 210, bed at 40 on my maker select 2. Feed rate is 60mm/sec in this area, print cooling fan was spinning 100% PWM. Any input would be appreciated. 20% infill