Earlier quoted context omitted.
Monero is only as private as its entry and exit wallets and the availability of the appropriate keys. This can be done with cash delivered via post with no return address. Observers cannot know who sent the money or even that the receiver is getting money without opening their mail. The sender remains anonymous regardless.
Anyway, we can compare cash to Monero. I'm not sure why some people here are obsessed with cash. I like cash too, it has some advantages any digital payment solution in general, but it's not more anonymous than Monero. It's not as easy to use as Monero, it's not as secure as Monero, and it's much more centralized than Monero.
I don't need to connect to any network to exchange cash, or engage in mathematical backflips to convince the network to accept my transaction. That makes it more decentralized and more fault tolerant.