Still I believe it is hard to ignore improvements in modern weapons precision.
Get it?
That’s tens of millions, and I’m being generous in ignoring how you’ve moved the goalposts. Your thesis is simply unsupportable, sorry.
Besides, we don’t know what the future holds, but in terms of raw possibilities we can now end all human life on Earth thanks to technology. That’s also new in the last 70 years. Hopefully we’ll never do it, but we could. Thst also flies in the face of the “technology reduces casualties” business. Of course, so does all of human history for thousands of years, but hey, let’s keep it simple.
It says "This study reveals that U.S. military forces were directly responsible for about 10 to 15 million deaths ", which is not "tens". Now imagine death toll if US would directly fight war with USSR over Europe.
And yes, it includes Vietnam and Korean wars, where high precision weapons weren't used yet.
The total casualties in the wars between the superpower-led coalitions substantially exceed the casualties caused by the US military in those wars. (And, in any case, yes, in the normal way terms of scale are used, a number ≥ 10^7 and < 10^8 is usually described as “tens of millions”.)
The long amorphous war(s) in Indochina alone seems to likely be on that order of magnitude.