$10 off $20 Spend @ eBay via App

EDIT: For the benefit of any doubting Thomases out there, here is a screenshot of the email containing the offer that my partner received.

Note also that the expiry date seems to vary on an account to account basis.

I know it says "$5 off eligible items" in the Terms & Conditions, but that's what comes up when clicking the link on my summary page next to my $10 off $20 spend code.

Terms and conditions:

$5 off eligible items when you purchase via the eBay app
By using or attempting to use the redemption code for voucher you agree to accept and be bound by these terms and conditions.
The voucher entitles you to the discount value set out in the voucher section of your My eBay account off the total purchase price for one transaction from any of the items listed on the ‘eBay App’ except for ‘excluded items’ mentioned under 12 (discount applies to item cost only, excludes postage).
The voucher expires on the end date specified in the voucher section of your My eBay account. Any voucher which is not redeemed by 23:59 (AEST) on such end date will cease to be valid.
The voucher is subject to any minimum spend requirements or maximum discounts specified in the voucher section of your My eBay account.
Limit 1 transaction per voucher unless otherwise stated. Multiple items can be purchased in one transaction (up to a maximum of 10 items per transaction).
The redemption code requires payment with an Australian PayPal account or a Debit/Credit card in order to take effect.
To redeem this voucher, enter the redemption code into the redemption code box during the checkout process. You must be an eBay.com.au registered member.
‘eBay App’ means; purchases made via the eBay app in the following operation systems:
iOS (iPhone and iPad)
Android
The voucher is linked to your eBay User ID. The transactions must be completed with the eBay User ID specified in the invitation email in order to redeem the voucher.
Your eBay.com.au account must be active at the time of redemption (not suspended nor made inactive by eBay) and must be registered under the same email address.
eBay reserves the right to disallow or reverse a discount in circumstances where it believes a sale or purchase of any item as part of this sale has not been made in good faith. This includes any collusive conduct by buyers or sellers or any other conduct which eBay considers unfair or untoward.
Gift cards/certificates/vouchers, Real Estate, Cars/Bikes/Boats, Coins/Notes/Bullion and warranties/ product protection plans are excluded from the use of the voucher.
Postage costs are excluded from the use of the voucher.
Not to be used in conjunction with any other eBay coupon/voucher.
Sellers are responsible for their own stock and eBay does not guarantee the availability of stock.
Items will only be shipped to addresses within Australia.
eBay makes no representations or warranties of any kind regarding the item purchased upon redemption of the voucher.
In the event you return or seek a refund on any item purchased using a voucher, the value of the voucher will not be refunded to you.
The offer cannot be withdrawn into your bank account and cannot be transferred.
To the extent permitted by law, eBay will not be responsible for any loss incurred by you in redeeming or attempting to redeem the voucher or for any costs, damages, accident, delay, injury, loss, expense, or inconvenience that may arise in connection with the use of the voucher.
eBay reserves the right to vary the terms and conditions of the offer at its reasonable discretion by publishing revised terms on ebay.com.au.
The parties submit to the non-exclusive jurisdiction of the courts of the state of New South Wales.