To be specific, Reade does make a few factual errors but they are not important in his overall work. He is quite wrong about how the socket signals worked. These made a loud bang at deck level, not high in the air, as Reade has them. That's because they were in effect little mortars. When fired they sounded like a cannon. When they released the stars they only made a dull thud. Reade's comments on how far they could be heard are not valid.
Some things are a matter of judgement. In my opinion, Reade places too much value on several bits of evidence. I don't have much faith in evidence from Captain Gambell, which comes to us via the press. I'm not impressed by Rostron's supposed change of mind, which is also second hand. I believe Rostron got in right in 1912, when he said he didn't see Californian until she was quite close to his ship. Reade uses other evidence from Bissett and Crawford that I find untrustworthy.
Where it really matters, Reade got it right. He found the facts about company signals, which were a red herring, originally introduced by Lord. Any officer would have known that no company signal lasted more than 2 or 3 minutes. Reade chased up the silly Samson story thoroughly. This should now be a dead issue, but Lord's apologists still drag it out. Reade also found the Boston reports of Lord's evasions and fictions.
Reade isn't perfect but he mounts his case like the lawyer he was. Whether a jury would convict Lord is another thing. In 1912 legal opinion was divided. The circumstantial evidence against Lord is strong, but it's possible that he was guilty only of apathy and excessive faith in an incompetent subordinate, namely Herbert Stone, followed by an amateurish attempt to save his skin.