It's more to do with the overall intensity of the anomaly. If you'd like to become thoroughly confused, I'd recommend looking up remnant magnetisation, which is the bane of my existence.
It seems clear from articles in the past 10 years a meteor strike is very unlikely.
e.g. - if you look at the wiki reference [7] "The Bangui Magnetic Anomaly Revisited" they clearly say no with what seems like an air tight explanation.
I know wiki isn't a source of truth, but academia doesn't seem to be stepping up with solutions. Someone needs to say the meteor strike theory is very unlikely and needs more updated evidence or modelling to still be taken seriously.
Speaking of which...I can't revert the edit because someone at the place I work got our IP banned from editing, but can someone remove that silly "see also" link that was added today?
https://news.ycombinator.com/item?id=24915542