I can confirm that one-bomb deathbombs are still in IN, as I've had one on my first Hard 1cc (on stage 4 or something), very much not planned but it probably saved me as I finished Hourai Jewel down 0/0...
Now, PCB Extra 1CC... I start Descent of Izuna Gongen 1/0, get killed near the end but hey, I still have a few bombs, and sure enough Ran goes exploding... and I run into a bullet, Game Over, would you like to save this replay?