You make terrible points.
You cant see it for a second, its like .75 or something. But you can see him cast it, and its usually pretty easy to tell where he is casting it. If you dont see him cast it and stay in that same location, you arent paying enough attention and its your fault you got caught. - Get better
Considering his ult is ALWAYS BEHIND HIM, this is a stupid thing to say. I cant really explain how dumb that comment was.
His Q first half is super weak compared to all other mage Q's, and the second art isnt hard to dodge at all even when ekko tries some tricky positioning.
Basically it sounds like you just arent very good. I dont know what other explination there is.