Earlier quoted context omitted.
You're right, but the problem is much worse than that. Examining 200 entries from Garner's Modern American Usage at random reveals that half of them are easy to implement, the kind of thing that could be assigned as a homework problem (e.g., recognizing that “$10 USD” is redundant, that “very unique” is comparing an uncomparable adjective, or that people from Michigan are called “Michiganders”, not “Michiganites”). T…
Furthering the complexity of this topic... While "$10 USD" may be redundant in a newspaper published in the USA, it's immensely useful and arguably preferable when writing blog posts, emails and other text destined for the "World Wide" Web. While USD is commonly used as and many are comfortable with its use as a "common denominator" when pricing something on the Internet, it's still very important to be clear "what d…
If the context is explicitly local (such as a local newspaper, menu), then $10 is sufficient in the United States.