Tecmo has released 3 games on the switch this year, all of them being similar in theme
3 hopes and touken ranbu sold pretty decently on the switch, so I don't think koei are that disappointed with the recent release, it didn't sell THAT much better on ps4 anyway
The playstation brand continues to get Japanese support because there is still a market for games on the system, and that won't change unless Sony do what Microsoft is doing and only release games digitally in japan