Most of the corrosion is close to the top end
There’s some corrosion up near the bolt head, so it’s not entirely asleep
A one-year-old magnesium rod looks pretty good
Overall, it looks like a definite win.
Anything that can thrive in 120 °F water gets my grudging respect.
I could have reinstalled the rod and left it for another few years
What you do not want: the wrench rips the corners off the head before loosening the thread.