It may not even be that much of a real increase. The "1000%" increase chart in the article doesn't have any y-axis label, which is suspicious. Plus percent increases from a small absolute starting point are misleading.
Skimming article, it looks like increase is in dark web posts about MacOS zero days and CVEs rather than actual successful attacks.
Yep. Seems to be a sensationalized piece that basically boils down to "Mac market share in enterprise is now more than a rounding error, so hackers might start targeting it"