Wrong, forensic doctor Aurelio Luna, Director of the external service of forensic science of University of Murcia found traces of a cultivated bacteria in the exhumed body of Pablo Neruda. This is enough to raise suspicions about his death.

Remember that assassinations in hospitals during this period were not uncommon. It is also suspected that former Chilean president Eduardo Frei Montalva was killed by the regime during a hospital stay.

All I know is what I've just read in the Wikipedia article, but nobody seems to be claiming that he didn't have cancer. In fact it's part of the story, with his doctor injecting him with some sort of poison instead of treatment. So "you guys, he totally had cancer" doesn't actually disprove anything. It's entirely possible to murder a cancer patient.