That wood is not punky. It's the colored "heart" you are seeing.
And even if it was truly punky, which is another term for rotten, WGAF. Burn it. Your stove can not tell the difference.
I have a saying, as I sell log truck loads of wood for firewood all the time...
"Into every load a little punky wood must fall."
I don't know a maple (it's almost always a maple that is punky) is rotted until I cut it most times. Looks solid, but the heart will be rotten.
What can I do? I have to pull it out, and I have to sell it. I can not separate a few punky trees, so it goes right on the truck with the rest. If there's a LOT of it, then I adjust the price to reflect it. But it's a rare load of firewood that doesn't have a little punk in it in NH.
BTW, the second picture down...is that Hard Maple? Hard Maple that has been tapped for syrup will have that pattern in the wood.