Yes. And Moses had a crappy grasp of Trinitarian theology too. So?
I think Sheldon Vanauken had it right. Lewis was a sort of second Moses, leading a huge number of people to the Promised Land of the Catholic communion while never quite entering in himself. My only concern about seeing him in heaven is that he will be so close to the Throne and I’ll be so far up in the nosebleed seats (assuming I make it at all) that he’ll be invisible. I hope I can fail as badly as he did in bringing people to Christ.