actually not true. He can build to counter them and run a bruiser build. His problems though are that he has absolutely no scaling or utility
he has plenty of damage if he is built for it, but he's low range
you could build corki bruiser or tank and go even with your lane opponent or better, but there would be no point unless your intent is to snowball the other lanes because he's essentially dead if built for damage or a low damage threat if built for other
if you compare him to quinn or teemo, both provide vision, teemo provides map pressure with his ult and both function on high damage builds
if you catch a corki, he either has to jump away immediately or he dies