וַיֹּ֕אמֶר אַתָּ֥ה זֶ֖ה בְּנִ֣י עֵשָׂ֑ו וַיֹּ֖אמֶר אָֽנִי׃
At sinabi niya: “Ikaw nga ba ang aking anak na si Esau?” At sinabi niya: “Ako.”
Rashi
ויאמר אני AND HE SAID I AM — He did not say, “I am Esau”, but “It is I”.
Rashbam
אתה זה בני עשו, it would appear that you are my son Esau.
Or HaChaim
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.