I would certainly not sell the product on eBay in future. Not worth it.
Do you have a stock of them ? Another site like FBMarketplace might be less safety-concious.
If your customer complains, send tell them to return it for refund. Don't argue the point.
If nothing else, any loss is tax deductible.
Because eBay is "sometimes" wrong, especially when AI gets involved as it often does nowadays, you should also check online to see what the recall was and when.
You may be able to return any existing stock for a refund of your own.
Aaaand I just noticed you are the buyer.
Check Google/internet before continuing to use the product.
You may not have time left in the Money Back Guarantee for a refund from the seller, since the MBG only lasts 30 days from delivery.