In terms of tolerances, this works out as a tilt of less than 1/3 of a degree…so it’s probably well within limits.
Manufacturing tolerances for the aluminium components will be very precise, for the silicon feet, probably more generous, so this could even contribute to this sub-1-degree tilt.
Looking back, you’ll see similar threads with people finding a tilt on the iMacs of previous generations. It’s probably ‘normal’. I had my old iMac for nearly 10 years and never noticed a tilt, but I’m almost certain if I measured it, there would be a slight disparity.
Hope this helps.