They may well have approached him, too. He also might not remember that email, and it might not have been an official approach. It may not have been a lie as such but it doesn't look good. At best it makes him look inaccurate, and at worst dishonest and overly invested in the case.
Although I trust his actual medical opinions, Dr Evans does himself no favours with the emotional way in which he expresses himself. He makes it far too easy to accuse him of bias, and for the defense to attack him as a person.
I hope the prosecution point out that the defense have not been able to attack Dr Bohin, and her conclusions are almost always the same as Dr Evans'.