I asked my wife if they were thanking Japan for all the Americans they slaughtered in WWII especially at Peral Harbor?
That does not bother me because I am sure there were a lot of Japanese who were conscripted into their armed forces and were forced to fight, just like soldiers and sailors in the Third Reich. And the movie did a good job of portraying the Japanese as the bad guys, particularly in the scene of the execution of Bruno Gaido.
A more obvious concession was the inclusion of the Doolittle Raid, which I think was included as a sop to the Chi-coms by showing Chinese people helping Doolittle in his escape. I don't think the sequence was needed to advance the narrative, but I can't complain because I liked the sequence even though it was gratuitous.