Actually, that law was repealed, for the same reason that they're turning up the heat on couples kissa and happening bars - the 2020 Olympics.
The Japanese law against dancing after midnight has NOT been repealed yet. It's still illegal.
It's under consideration and might be repealed in June of this year. And they still put a "twist" in the law, so police can crack down on clubs for low lighting.
These crackdowns, are usually scams in themselves. Where instead of doing real police work like going after murderers, robbers, drug dealers, gangs, etc... They are old-fashioned prudes pretending to protect from things that are of no threat or importance. Raiding a dance club or breaking into a private club where consenting adults are having sex, is of no value to the public whatsoever.
Clubs in Roppongi, Shibuya, etc... are still technically in violation of this old archaic law, that's randomly enforced. Not only dance clubs, but various dance schools (yes, even dance schools) in Japan are technically in violation, and have been in fear of being raided and closed down.
So you should perhaps stop dancing too, in addition to stop enjoying sexual fun in Japan. Nothing would make an old backwards prude happier. Rather you overwork yourself to death or commit suicide.
And they are not turning up the "heat" on Happening Bars and Couple Kissas specifically. Their "turning up the heat" is equal to all P4P, soaplands, delivery health, escorts, etc... across the board.
The average tourist has NO idea of such private member clubs, couldn't find them, NOR get membership in one. You are also talking about private clubs, in which a tourist walking down the street would have no idea whatsoever about such.
Most tourists are NOT swingers. It's disingenuous to act like the majority of tourists coming to Japan are into such, even in their home countries. Far more tourists would be heading towards prostitutes, at something like 1,000 to 1 or more.
The average tourist is far more likely to have access to regular P4P, like escorts and delivery health. And is far more likely to know about and visit a soapland, Chinese woman soliciting on the street corner, or an escort.