I feel dumb for thinking "Caveat emptor" in the title meant "end of story". I don't quite understand why latin terms are used so often when plain english gets the point across to more people.
If you talked to your plumber and said you have a "web server" in your basement, he'd think you give funny names to spiders. The concept of "web server" is a technical shorthand for "computer attached to a telecommunication system, typically the global internet network, that is dedicated to responding to request from other computers for hypertextual media to be delivered over such network". But webserver is shorter and everybody in your sector understands what it is, so you use that. Sure, you could say "I have a computer connected to the network that does stuff", something that "would get the point across to more people", but it would be a very rough and incomplete image.
In the same way, people in literature, rhetoric, law, and medicine, use a lot of Latin words to convey specific meanings succinctly. Anybody worth their salt, in the sector, will appreciate them more than "plain English".
Except that is not the case here. "Buyer Beware" is more succinct and in the same language as the rest of the headline. It's also not a domain-specific term, so shared convention is out. The author is sprinkling on some Latin to seem smarter.