The Bible is so crystal clear on the subject I can't understand how anyone who could claim to be a scholar could make such a false statement.
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I mean really!
Human nature is subject to death. Which means that it is mortal. Jesus' nature he carried to heaven 'dies no more" as Paul clearly says.
A nature that is subject to death, and a nature that is not, are two different natures.
Many scholars are subject to be biased, just as translations.
My friend: A.T. need not claim to be a scholar of koine, he is!
The One who consumed death/ thanantos into Himself, has earned the right to walk thru doors or anything else He so desires!