Earlier quoted context omitted.
Your coworker needs to read the Suttas. Shakyamuni explains again and again and again that the teachings are for everyone .
Yes, this Chen person is so so wrong. She says that meditation is for some monastic elites, but that is far from the truth. Who even chose to publish her book? Buddha himself said to Ananda that several thousand of his household desciples attained Nirvana. Not only did these "laymen" did meditation, they even attained Nirvana.
She did not quite say that. She said that it was only practiced by monastic elites up until the early 20th century:
"Meditation was not at all a mainstream lay practice in Buddhism. It only became popular in the early twentieth century, when Buddhist reformers such as the Burmese monk Mahasi Sayadaw, founder of modern Vipassana meditation, promoted it as a lay Buddhist practice. Mindfulness, as it was practiced for most of its history in Asia, was a very elite practice reserved only for advanced monastics."