Who was this written by, a Brit?
Nope. Likely an American.
When cooking, people in general like to use round numbers, like "200°C", since a difference of 5°C in oven temperature is not a big deal.
And yet they went with some oddly specific 205°C. That only makes sense if they're used to Fahrenheit, eyeballed a round value (like 400°F), converted it into Celsius (204.4°C), and then rounded it up to discard the decimal.
I'm also going to say they're completely clueless when it comes to cooking - 200°C is the oven temperature. The chicken itself reaches a far lower temperature, in the 70~80°C range. By the time the chicken reached 200°C, it's already dry and close to catching fire. (The self-ignition temperature for biological stuff is typically between 200°C and 250°C.)
Without giving you spoilers: based on the novel, the 1st arc is really special. The other arcs (like the 2nd world) are still fun, still worth reading, but they don't reach the same level as the 1st one.