That footage was eventually aired on Kansai TV (KTV) who included the footage as part of a local TV show, "Wonder". Sadly the total footage that KTV aired of Maruta was less than 7 minutes and included things like an interview, training footage, footage of the youngster at school, and, finally, some footage from the bout with Canoy.
Sadly it appears that this may be all the professional level footage we get from the bout, unless KTV take the decision to air the bout, in full, some where down the line. Sadly that is looking unlikely.
Whilst the footage, or rather the amount of it, is disappointing, it is interesting that KTV is the one that aired it, given that they are affiliate of Fuji TV, who have heavily backed Naoya Inoue and Ryota Murata, possibly hinting that they are going to back Maruta in the future just like they've backed their two star.
For those just interested in Maruta Vs Canoy, the footage of that starts about 4:30 seconds in.