Mars' lost magnetosphere
"Mars' atmosphere has been scraped away over four billion years since it lost its protective magnetic field (magnetosphere), which was likely caused by meteorite strikes." (my emphasis)
WTF! - where did this idea come from?
Meteorites are small pieces of surviving debris that result from a planetary impact by a meteoroid, asteroid or comet - they are formed by the impact and thus cannot be the striking impactor itself.
Moreover, there's nothing to suggest that Mars has experienced, impact-wise, anything different to any of the other major bodies in the solar system, neither during the Late Heavy Bombardment nor after it - any effects upon Mars, by meteoroid, asteroid or cometary impacts, would be the same as those experienced by the other bodies in the Solar System, including the Earth, which has not lost its magnetosphere as a result.
In any case, a planet's magnetosphere is generated at least several hundreds, if not thousands, of km below the planet's surface and there's no known mechanism for an impact, of any size less than another planet/planetesimal, that could penetrate that deeply to affect a planet's magnetosphere.