The article should say in "rich,high income countries". In the vast majority of the world,most companies and governments will not be running Macs anyway - most likely much lower cost PCs running Windows and increasingly Linux.
Edit!!
The hilarious thing is to just look at the marketshare,especially outside the US and maybe UK and a select few high-income European countries,I expect you will find far less penetration of Macs as they are still premium computers.
A lot of third world countries are increasingly trying to go onto cheaper ARM/MIPs based platforms running non-Microsoft or non-Apple OSes too,so forget about a £700 computer - even a £200 Windows device is too expensive.
Second Edit!!
Thats another issue with the article.
It does not take into consideration,I suspect,all the recycled old machines in the third world too.