That quote was Russian observations on their securing valuable technical information, but lamenting on their inability to overcome their capability gap through spying due to changes in tactics of their "main adversary". In WW2, a major factor for the US Naval success in the Pacific was a change in attack doctrine. Aircraft would attack relentlessly from multiple directions, overwhelming the Japanese defenses. In the Battle of the Bismarck Sea, when Australian and US pilots mauled a Japanese supply convoy with Bristol Beaufighter aircraft. In the battle, aircraft fake a torpedo run, the ships changed course to align with the aircraft and minimize the attack surface, then they were strafed with the four 20 mm cannons. The air campaign in the Pacific was much more vicious and effective than Europe. One of the pilots quoted
"They went in and hit this troop ship. What I saw looked like little sticks, maybe a foot long or something like that, or splinters flying up off the deck of ship; they'd fly all around ... and twist crazily in the air and fall out in the water. Then I realized what I was watching were human beings. I was watching hundreds of those Japanese just blown off the deck by those machine guns. They just splintered around the air like sticks in a whirlwind and they'd fall in the water."
The Russians have difficulty adapting their tactics on the field. Reviewing the successes of the US battles must be quite different than throwing bodies at a front line.