Critical run pace large decrease after ROB

Hi Everyone, I did my ROB few days ago after 2h30min race pace bike. The conditions were tough with temp around 86deg. My run was not the greatest and Athletica recommended decreasing my “Critical Run Pace” by over 1min/mile which i think it is very significant decline in fitness. Did anyone experience similar thing (i would say my fitness is actually increasing nicely based on my Garmin metrics). I did decline proposed change since it didn’t feel accurate. I’m Wondering if Atheltica algorithm takes to account previous training fatigue or external factors like hills or temperature? thanks