I'd say, .com is just the default. If you go location/topic specific, you go with another TLD.
To the 130 million (domainnamestat.com) domains, registered in the US, there are like 500 million domains, registered somewhere else. I couldn't find any numbers for how many of those are .com and how many aren't, but you cannot just ignore those. Just because most domains registered in the US are .com domains, doesn't make .com a US domain. That's a really egocentric point of view.
That means the exact same thing in this context. Genuinely interesting that you're not the only person who understood it a different way and suggested "default" instead. Neither would stand up to such pedantic scrutiny if you want to argue that one of them is wrong.
In such a short sentence about a topic that everyone here surely knows about, the words only reference the relevant aspect of the underlying information. You can't know if they have the wrong or right view without more information.
That said corporation lets non-US entities buy domain names doesn't change this fact.
Similarly, if a site with a .tv address published articles explicitly about Tuvalu, in the Tuvaluan language, you probably wouldn't complain about a Tuvaluan bias, right? After all, it's a Tuvaluan TLD. The fact that lots of companies around the world use .tv addresses for other reasons that have nothing to do with Tuvalu, doesn't change the fact that it's a Tuvaluan TLD.
If you want more information on this, the intro in the Wikipedia article on .com is quite informative: https://en.wikipedia.org/wiki/.com ... particularly:
> The domain was originally administered by the United States Department of Defense, but is today operated by Verisign, and remains under ultimate jurisdiction of U.S. law.[2][3][4] Additionally, as the Internet was invented in the United States, most American businesses and enterprises have used the .com domain instead of a more U.S.-specific .us.
.tv addresses are different, because ccTLDs are explicitly tied to countries (hence "ccTLD"). generic TLDs (gTLDs) like .com are not.
.com registrations are ultimately under US jurisdiction. It's what happens when you have a name system that was originally intended for one country's project (The Internet) and said project ended up becoming internationally used. The original TLD's are grandfathered in even after we got country-specific ones.
Nobody complains that .mil is US-centric either. .mil isn't a ccTLD but of course it means US military.
.com is a very popular TLD used all over the world. It doesn't make it non-American. Just as .tv is also very popular outside of Tuvalu, it doesn't make it non-Tuvaluan.