Umm, Idk if you've noticed, but Madara has been redesigning the entire terrain throughout the entire fight. So your comment is actually invalid..... Look at his eyes, they're rinnegan, he had been fighting with susanoo with EMS eyes.
As soon as he activates his rinnegan, his susanoo becomes a beast. And we all know up to now, that he didn't have rinnegan until after his fight with hashirama.
And that quote just means he hasn't taken them seriously at all, he has only been toying with them. However, he couldn't do that with hashirama, because he actually took him seriously. Therefore, he spared no jutsu in that fight and unleashed his big guns. It doesn't necessarily mean he used this perfect susanoo.