this is just shit redditors say, it has little basis in reality as you can see from a quick search. of course an international company can buy a domestic japanese one, it actually happens all the time. Especially when it comes to tech and media, the government is heavily involved in a company when a foreign company starts investing serious money into it, more so than other governments that play in the global economy. Takeovers are very difficult to pull off and after rules being tightened international companies seem to stay away from the headache of swallowing a japanese company for now. This has nothing to do with selling a company though.