The Japanese don't care about half-Japanese guys that were born and raised in Canada. They pay a lot of attention to homegrown stars that make it big outside Japan (Ohtani, Hachimura, Osaka)
Just because a star and some teams show up for a few games, doesn't make sport any more popular.
It took 20 years or so, but Gretzky's journey into California has shown some results in hockey players coming from California. But that involved a lot of local kids adopting the sport, rinks being built and coaches popping up all over the place.
Baseball and soccer are so dominant in Japan that hockey will always be a regional sport.