Hi @Nicholas451
Welcome to the forum, and hopefully we can help you and you might be able to return the favour at some time!
Each region has its own Terms, but pretty much they're very similar. In the UK where we're based, Section 19 of the terms is where you will find all the Arbitration information, and quite possibly will be the same section in your own area.
This is the UK hosts and Europes direct link: https://www.airbnb.co.uk/terms#eusec201910_19
This is the Americas general Terms link: https://www.airbnb.com/terms
The cost is $200.
If you have a sizeable claim then the $200 will be a small price to pay.
You don't say whether your claim is Covid related, but because of the controversy over the Extenuating Circumstances implementation, I'd pretty much guess that Airbnb will not be wanting to allow Arbitration cases of any kind to succeed on any significant level at the moment, so rather than take the risk of losing your $200 plus your claimed losses, you might be better advised to have a Lawyer 'holding your hand' for a fee. Already these people have overturned Airbnb objections which only Lawyers would know how, so it may be worth your while consulting with one of those Lawyers who have already been there.
One such firm can be found at 10000hosts dot com, 'ten thousand hosts dot com' or another 'legalbnb dot com'. 10000hosts dot com are posting particularly valuable information on their website and also their Facebook page, so well worth looking into.
Your situation sounds similar to some other members' predicament mentioned on here a few months ago, perhaps they will chime in personally, or if not, I'll try to search out their posts for you, which you might find useful.
You seem confident with the evidence you have, so Good Luck, and I hope that you're successful with your claim and it doesn't take too long to be satisfied.