not accurate at all
hinault crashed in a sprint at St. Etienne (amongst a whole group of favorites that included LeMond) - he blamed Anderson. he was not trying to slow the peloton for LeMond to gain time at all.
LeMond was not told to attack Roche. He was told many times that Hinault was just 30 seconds-1 minute behind and closing fast. He was told to wait.
whether LeMond could have threatened Hinault without Hinault's crash (and riding on a different team) is debatable at best. LeMond has said that he revered LeMond as a "big brother", even a "surrogate father figure" and that Hinault was really good to him in his early years, taking him under his wing. However, it also meant that LeMond was slow to understand that Hinault now perceived LeMond as a threat and wanted to win for himself.
Watch Slaying the Badger. Kochli clearly states Lemond was told not to ride with Roche, but he was free to attack Roche
Hinault was only about 1 minute behind Lemond. Lemond is LYING. Yes, he got bogus info from a CBS cameraman in real time. However, the edited post processed CBS footbage clearly stated Lemond was only ever about a minute ahead
Here is the post processed cbs telecast