Yes, I think the author's criticism of the original article is a bit harsh and misdirected. There are lots of caveats and qualifications in the original, includ

Yes, I think the author's criticism of the original article is a bit harsh and misdirected. There are lots of caveats and qualifications in the original, including the frank admission that the transducers are difficult and expensive to make. It also includes explicit statements to the effect that a cheap ultrasound machine is not intended for serious medical use but rather for "education, imaging, sports training and just for fun."