Not only the crook that's bent....
The octave key being open is partly because the closing spring isn't there. So it's clearly not playable.
The sax is already expensive for it's poor condition, even without the neck problems. And there are only 3 bidders so far. Plating looks as if it's been gone over with wire wool to remove the tarnish, so it'll never shine.
However (my paraphrasing) he says "It's in good condition for it's age", and "It's in working order".
It's clear from the pics that neither is true. His excuse that he doesn't know anything about saxes is interesting - how can he make these statements, especially as to working order, if he doesn't know saxes?
I'd contact him again, saying that his description is False and misleading - it's clearly unplayable and in much worse condition than the description. Tell him that as a result you wish to withdraw your bid as previously requested, and that if he doesn't let you, you'll be taking it up through ebay. If he still fails, do go through ebay's dispute resolution.
It's worth looking at seller's feedback - there's a recent negative, which doesn't loko as if he's a good seller. Blames the seller for his incorrect description.....