I've noticed an ebay 'code' in buyers addresses - can anyone tell me what it's for please?

Can anyone tell me why there's an ebay 'code' in buyers' addresses now - what's it for?

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Here's info about it:

 

https://community.ebay.co.uk/t5/Announcements/Royal-Mail-tracking-and-delivery-events-on-eBay-from-1...

 

It says "The unique eBay code will not be printed as part of the address on the postage label."

 

Not sure if that's true but if you write/print your own labels you can leave it out.