First of all, he DID link the video, and second, I believe that you have a bit of a misunderstanding about how Lightning Network works. There truly is no such thing as a "Lightning transaction" in the traditional sense. On the Lightning Network, the only transactions that exist on the timechain are those to open and close channels. With bolt11, an invoice consists of a routing path (similar to TOR's onion, but technically slightly different), and payment information that is passed through that path. The actual "sending" of bitcoin happens through updating channel states between participants, which are essentially just promises backed by on-chain bitcoin in the channel. When you use bolt11 on Lightning Network, each hop in the routing path only knows its immediate predecessor and successor - they have no idea about the payment's origin or final destination, unless an attacker controlled all the nodes between you and the recipient of a payment they would have no way of knowing who you are sending money to, even if they were to track each payment at the packet level it would be extremely hard to figure out who the final payment goes to.

Also, with bolt12 route blinding lets the recipient hide their node identity from the sender, this means neither party needs to fully trust the other or reveal their network position.