one line in hebrew does not take away that Christ said that john the baptist was elijah in a past life and that john the baptist was not an angel but a man like every other man, born from a mother.
and no one really knows who wrote hebrews. who ever it is does not have the authority to contradict Jesus.
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The book of Hebrews quotes extensively from the Old Testament. Paul, as a Pharisee, would have been familiar with the Scripture in its original Hebrew language. In other letters, Paul either quotes the Masoretic Text (the original Hebrew) or paraphrases it. However, all of the quotes in this epistle are taken out of the Septuagint (the Greek Old Testament), which is inconsistent with Paul’s usage. Finally, Paul was an apostle who claimed to receive his revelations directly from the Lord Jesus (
1 Corinthians 11:23;
Galatians 1:12). The writer of Hebrews specifically says that he was taught by an apostle (
Hebrews 2:3).