If you're referring to Curse of the 13th Ghost I don't think we would denigrate it as "fan fiction" just because none of the original creators worked on it.
To make a comparison: with the show Doctor Who, do you think any of the people working on it now worked on the original show? Yet it's all one canonical continuity.
What sort of errors do you think the new film has with the original series? I'm betting we can come up with explanations to make it work out if we use our imaginations.
Since this might involve spoilers perhaps it would be good to start a new thread with a SPOILERS warning at the top for those who haven't seen the 2019 flick yet?