בראשית כז:כד פירוש: רש״י, רשב״ם, אור החיים ורד״ק

ויאמר אני AND HE SAID I AM — He did not say, “I am Esau”, but “It is I”.

אתה זה בני עשו, it would appear that you are my son Esau.

ויאמר אתה זה בני עשו He said: "you are indeed my son Esau" Isaac justified his bestowing the blessing. This verse is not a question. Jacob's reaction was a confirmation that Isaac was correct, of course.