Even if you can learn from Torah how to heal people , today to open the office or get a job in a hospital, you need to get a licence. This means you need to get a secular education. And not only a doctor need a licence to get a job.
Also, if every Jewish man will learn full time and every Jewish wife will work as a morah part-time, every Jewish family will live in poverty. Who will give a Tzedaka if no one works? How morah, who has 5 kids and a husband in a kollel, will pay 5 tuitions and the rest of the bills? If every man learn full time, it means father-in-law also learn and can’t support his son-in-law.
I don’t think Rav Shteinman doesn’t know about this.
I truly believe, that we can’t quote Rav or anybody else without giving all details of the speech and situation in which this speech was given.