וַיֹּ֕אמֶר אַתָּ֥ה זֶ֖ה בְּנִ֣י עֵשָׂ֑ו וַיֹּ֖אמֶר אָֽנִי׃
Ishak bertanya, “Engkaukah ini Esau, anakku?” Ia menjawab, “Aku.”
Rashi
ויאמר אני AND HE SAID I AM — He did not say, “I am Esau”, but “It is I”.
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.