The narrative is a BS. The Battle in the Bismark Sea, March 1943 is known for the use of modified B-25 Mitchells. Those were the
4-GUNS-NOSE planes, modified in Australia, known as Pappy Gunn's strafers.
The 8-guns-nose (J2) is a factory design and is a kit to be installed on ANY B-25, thus many B-25G and B-25D having them. The first part of the video shows B-25G with the canon and has nothing to do with the text behind. The original movie which was used is called
B25-G Bombers w 75MM M4 Cannon on a Combat Mission WW2 USAAF Aerial Action Footage.
Those pseudo-historical videos with a robotic voice behind, using some footage loosely based on the topic are a No-No!
Put them in the thread "AI failed again".