A bit overstated, as Doug puts it, seems a bit understated to me. Sure, Japan may have "won" some rounds about limits on car imports and whatnot in the early 90's, but it has lost on lots of international settlements like the Basle accords. (Perhaps this doesn't look enough like an economic "confrontations" to Wallerstein, which is why he ignores it.) In the initial negotiations, the Japanese were able to link bank capital levels to the stock market; in the year of the accord, 1987, that gave them beaucoup capital to count against assets. After 1990, when the market began to fall, they were not so happy, as the falling market began to choke off capital and the ability of banks to lend. (And, btw, the market began to fall during the Iraqi invasion of Kuwait.)
And what about the Asian Monetary Fund proposal floated by Japan after the Asian crisis? The U.S. shot that down rather eagerly. I think that counts as non-negligible, certainly a political and economic loss for Japan.
All best, Christian