The score you calculated will be correct. The rule doesn't get violated since all youryou're doing is scoring an entity.
The "holding constant" rule essentially helps you identify how much influence each variable has on the outcome. In the presence of multiple factors, the only way for us to estimate impact of one variable is to control for the others.
Interpreting 1.1 to be the contribution of apples would only hold if you compare two people who both eat the same number of oranges.
