Easy out! They should have came out without any of that prevantitive work. You need the hammer the T40 in there before you try and turn it or you’ll just strip it like in your case. They get dirty inside there and you’ll think the socket grabbed and it won’t.

You should just get an easy out though. It won’t damage the threads.

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Only diesels in this driveway.
2005 E320 CDI 243k Black/Black
2008 Chevy 3500HD Duramax 340k
2004 Chevy 2500HD Duramax 220k