It's not their Nationality that we're concerned with, it's their professional background, journalistic integrity and pass track record that are suspect and fall well short.
All of their articles have been based on poor research/false information, often used intentionally, to paint a false picture to suit their biased agenda and narrative; whether it derives from a bigotry view of anything Chinese or out of sheer ignorance - that I don't know.
As mentioned before by other posters, the National Interest does sometimes contain good articles (even if biased) by professionals such as Lyle J. Goldstein and James Holmes - but it is often the likes of Mizokami and Majumdar that writes with ridiculous sensational headlines (but have zero substance) which grabs the most attention.
If you want reliable, unbiased and well researched sources on Chinese military development, many of our fellow SinoDefenceForum brothers here have their own content, here are some examples:
Henry Kenhmann of EastPendulum:
Jeffrey Lin and P.W. Singer of Eastern Arsenal:
Huitong's Chinese Military Aviation:
Blitzo's PLA RealTalk: