So you think that if the TV doesn't have your Wi-Fi password, it surreptititously turns on Wi-Fi and runs cracking software to obtain it anyway?
They still need to tie it to you. If you've not given it a shred of personal information, it has to be fingerprinting via surreptitious audio/video recording, or else by obtaining the purchase info from the retailer (like the name and billing address from your credit card) and matching that by serial number (which would have to be recorded during purchase).