Probably because it counters the quotes that you love to post that give the impression that Reagan was a dedicated free trader.
As Sheldon Richman demonstrates in his Cato paper, Reagan’s actions didn’t match his rhetoric. Reagan governed as a nationalist rather than a free trade zealot.
The majority of examples that Richman cites concern Japan, the main problematic trade partner/rival during Reagan’s administration. Reagan wasn’t shy about enacting limits on them. Those who like to cite Reagan’s record would do well to read Clyde Prestowitz, Reagan’s trade negotiator.