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No they are not, nor do they reveal what they're seeing.They even know enough to show no reaction whatsoever, no matter what they see. "Oh my gosh, you have a tumor the size of Cleveland!!! But we'll let the doctor talk to you about it in a few days, so forget I said anything."
Ultrasound techs don't do cancer diagnoses. They are not doctors.
These are cows, not someone's wife or child. It's not a medical "treatment." The "yahoo farmers" (oh, the condescension) weren't treating human beings or even cows for cancer. Why bring up breast cancer - and presume that's what the poster referenced - when all we're talking about is inseminating cattle?
Farmers don't have the luxury of calling a veterinarian every time they need to treat their animals, by the way. Perhaps you should watch a few episodes of Dr. Pol.
I and family members have had numerous ultrasounds for various reasons and never have I had a tech who would give an opinion on what they saw on the screen...never.
The dude a lying troll. He totally moved the goal posts to defend his indefensible position.