You know, maybe that is the quiet point of the report, to tell the public and businesses to leverage pressure on the government and cause more transparency. On the other hand, maybe it'll backfire.
I know from personal experience in late 2004 that US-passport carrying persons entering Japan with that passport being stamped can visit, legally, up to 90 days, but CANNOT work to earn income. Those who play/played the immigration/visa-limit merry-go-round could simply leave the country and return (with proper stampings) 24-36 hours later and restart the clock. If they had illegal gigs/income sources, such persons could indefinitely reside in Japan, so long as the neighbors did not finally get fed up and as the police to inquire.
However, many citizens/passport-presenting persons NOT presenting a US passport could/can enter for up to 3 MONTHS, AND the could/can subsidize their stay by working. Such passports-holding people could be from Canada, France, Germany, Australia, and a few South East Asia countries. I think Mexico and Brazil were permitted, too.
But, i think the Japanese limitations on the US stemmed from a spat between the US and Japan, maybe before the 80s. IIRC, the US or someone in the US was complaining about too many Japanese filling up US colleges and workplaces and soaking up information that would enable more intense Japanese competition against the US. But, also, probably more plausible is that the US probably has far more visitors to Japan (especially certified/authorized language instructors/teaching assistants, as well as the illegal types) than many of the other countries combined. Too many US passport holders, combined with the often begrudged presence of US military personnel, led to a severe restriction that US passport presenters could not work (in Japan) and subsidize their visit to Japan. This makes it possible to allow in a wider diversity of cultural contribution (artists, chefs, photographers, and so on) that otherwise might be impeded if too many jobs-takers from the US were allowed.
(Plus, cynically, i (and some i've talked with) have a feeling that an event in a month of August many decades ago may or may not be part of the mix.)