Julian believed that the spaceships were indeed scary and powerful… However, he felt that they would only have such strength as long as they are in outer space.
Now that they are here on the planet, he's not expecting them to perform really well… He realized this after being informed about the aliens' actions when they descended somewhere at the State of Kazan.
He was informed that after they landed on a specific spot, they remained in that position and let the smaller types of machinery conduct the battle for them…
"They're unable to easily move… It means that they're just larger target practice."
"Perhaps the gravity of our planet disrupts their technology…"
"I heard that Mana is unique to our planet… It seems that they aren't used to it…"
"Whatever it is… As long as their spaceship will remain unmoving, then it will be our win."