My source is the best possible:
PERSONAL EXPERIENCE.
If you want to accuse Japan of being sensitive to the appearance of being somehow illiberal at a few junctures then I believe you would be on the right track.
and if you were to accuse them of nimble editing of their National History, then I think that would be sensible also.
just saying, I could find no evidence of your claim.
certainly did not make any accusations.