Afshordi notes that their theory requires that the Early Universe was a stove that was at least 1028 degrees Celsius. In contrast, the highest human being can reach on Earth is only 1016 degrees Celsius, a difference of more than 12 orders of magnitude from the early universe.

This makes no sense at all... Steel doesn't even melt until around 1300-1500 degrees Celsius... This is just one point that makes no sense, of many. Way too much is far too factually incorrect to even consider... The hottest temperature reached on Earth is in the trillions of degrees Celsius and in those instances we do not see the speed of light increase....