Yes, you are right.   eBay have banned cash on collection and now block messages contacting phone numbers, addresses, etc. prior to online payment.    Buyer could pay and if they're not happy when they view the item you could agree to cancel and refund.

More info on here:

https://www.ebay.co.uk/help/selling/posting-items/setting-postage-options/local-collection?id=4181