I shall defer to your expertise, it does quite look like malicious intent cost the unfortunate officer his life. Hopefully his next of kin can receive the closure they deserve.
Also trained in judo for many years. But I'm pretty sure you won't injure multiple areas in one "grappling" incident and if you break a rib, you would normally sit out the rest of the day.
When you're training injury does happen but not in more than one area of your body unless you were literally being beaten to a pulp.
So yes, I'm 100% sure it was a malicious intent if they're claiming that he died during "bicycle training" which oddly included grappling.
Despite protections and whatnot shit happens. Usually in one place, or in an unfortunate combination of two.
Being driven over, pushed through a window, crashed by a piano and drowning is not usual in one session. Looks like this is more or less what this guy had happening to him.
When you're training injury does happen but not in more than one area of your body unless you were literally being beaten to a pulp.
So yes, I'm 100% sure it was a malicious intent if they're claiming that he died during "bicycle training" which oddly included grappling.