Yeh I forgot that it was Paypal. But the money coming back to people from chargebacks still isn't definately coming from Alpha T. It is coming from the Paypal owned bank account. I've had to deal with chargebacks before as an ex- Paypal-using merchant and the chargebacks get pushed through (with extra fees) regardless of how much money is on your account; which means negative balances. If AT don't have the money in the Paypal account, then the cash is coming from Paypal and AT will be asked to zero their account balance.
I have read that some CC issuers in the past have still gone with S75 even with PP transactions.