You can tell he's lying.
*straight face* "I think he does a wonderful job in this..." *monkey smile then abrupt straight face again*
I watched another interview with Arnold where he's going off about how great everyone is. And you know how he acts like every movie he does is basically Citizen Kane and he went on about how Jason Clarke was so perfect in his focus and that if they did 10 takes of a scene Clarke hit his mark exactly the same way on each and every take, Clarke really played the dual part of vulnerable 20-something plus trained warrior very well and that she really worked on exercising and gun training, and then when he got to Jai Courtney he said, "And he was so great as Kyle Reese because....he's been in these types of movies before, and he was just really in shape, and...has been in these types of movies before...." Not even Arnold could BS any actual specific praise for him.