No I think he's right about that (although maybe he is half-joking of course).
Anyone who says Dream Theater is too technical to be emotional is actually wrong and is missing something. That's an objective thing- as a musician, you develop the coordination skills in your fingers for the purpose of portraying emotion through them. Think about what the word 'instrument' literally means.. If it's a musical instrument, the greater control and ability you have over it, the more music (the artform; the expression of emotion) you are able to put across with it.
The more skill you have in the way of operating a lawn-mower, the more grass you can cut, and the more precisely you could cut it. The more technical understanding and skill you have of operating a blender, the more smoothies you could make, and the more precisely you could make them. A lawn-mower is a lawn-mowing instrument and a blender is the instrument of the smoothie. Why the hell does the understanding of a musical instrument not allow you to create more music more precisely then?
Like Portnoy said, Dream Theater's biggest criticism has always been how well they play their instruments. THAT is an invalid criticism usually made by either pretentious or musically/artistically lazy people. Other criticisms could be valid. That one- not.
Edit: to be clear, the only position I'm calling invalid here is the one saying there is no emotion because of the technicality. Saying you don't connect to the emotion for some other reason could be valid.