I suggest you read his books and his policy statements.
Most of his supporters here on FR have and did so before deciding to support him.
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The article in question is about whether or not Cruz brought Trump’s judgement into question. As an example, Trump pushed a nationalized healthcare system because Obamacare didn’t go far enough. In other words, socialized medicine. There are hundreds of interviews where he discusses his big government plan of the week on healthcare. He still pushes big government healthcare (at least he was in September).
Yes, I too question his judgement.
In 2011 he said the following in his book:
"Former Speaker of the House Nancy Pelosi said Congress had to pass Obamacare so we could find out what's in it. Now we have. And what's inside those 2,733 pages is a job-killing, health care-destroying monstrosity. It can't be reformed, salvaged, or fixed. It's that bad. Obamacare has to be killed now before it grows into an even bigger mess, as it inevitably will."
"One way to infuse more competition into the market is to let citizens purchase health-care plans across state lines. Why not allow people to buy health insurance across state lines and make companies compete the best plans at the best rates?"
Trump, Donald J. (2011-12-06). Time to Get Tough: Making America #1 Again (p. 131). Regnery Publishing. Kindle Edition.
He also has a chapter on tort reform with loser pay that I did not include in these snips.