what continues to be absolutely fucking hilarious about this is that this sort of thing already fucking exists in mainland china, in the form of a boxshop you walk into where everything is tagged with RFID stickers. slap the basket into location, pay with phone, leave. and it exists based on 2010+ technology, that's fairly reliable.
(minor note: I haven't seen this in person but I've seen coverage of it, and I've worked with all the actual constituent technologies so I'm quite aware of how real this is and how well it can work, barring all the fuzzy in-practice biz-rule shit that inevitably has to be handled and solved (such as all real-world systems))