The facts of the accident have always been very clear. He sustained a nasty mulitfragmented open femoral fracture alongside some other injuries that only occur in a high-energy trauma (sternal fracture, rib fractures, pneumothorax etc). At the age of 34/35 or whatever it was, that is always going to have a very high likelihood of being a career-ending accident. You don't need to know any more specifics to understand that, and Adams would have been advised as such.
I'd note that knowhere in the article you linked does Froome ever state he's back to full fitness or in anything other than an ongoing rehab cycle so not sure what your point is there.
History is also littered with examples of elite athletes who refuse to accept that the end of their career has come and retire too late. I'm not saying that I agree at all with Froome's persistence or behaviour over the last few years but when coupled with the fact he continues to earn a million € per year to chase this dream/delusion/whatever you want to call it, it is certainly entirely predictable.
This situation is entirely, 100% on Adams. He absolutely would have been aware of the huge gamble he was taking. He's made this entirely predictable situation for himself through some appalling decision making and should be taking accountability for that if he wants to "tell it like it is..."