The title is misleading. “ Some Apple staff have quit…” this is more in line with the content claim “Ten employees say they're quitting or know someone who is because of Apple's position.”
Apple has about 147,000 employees.
The linked article title appears to have changed now, at the moment it is:
Some Apple staff have quit because of the company's stance against remote working, a report says
10 people quit? That would barely qualify as news if 1000 had quit.
Which ten, though? Apple goes to extreme lengths to hire the very best of the best. One key technical contributor leaving can strain or stop development of new products or releases.
Some staff might prefer to work in an isolated environment to have more productivity rather than dealing with traffic jams daily. Staff might observe that it is better to work at home, especially if the product's performance is similar or better than the traditional working space.