Hello, I'm the "Paleface" of that referenced message board post mentioning the "OLCA CORPORATION" credit on an apparent title screen of the arcade version of Yosaku. This was seen in the one video I could find on YouTube that looked like it might have been the original 1979 arcade game: https://www.youtube.com/watch?v=FpR4J7yT0P4
But Google-Translating the Japanese comments below the video, the theory among them is that this footage is of a hacked and pirated copy of the original SNK arcade board: they say that Orca Corporation pirated a lot of "boards"--this appears to have been one of their pirated versions. Sources such as MobyGames, Arcade Flyers, and the Museum section of the "SNK 40th Anniversary Collection" game compilation all credit both the development and publishing of 1979 arcade Yosaku to SNK.