I really see Columbus Ohio as an extremely safe bet for the next 10-20 years.

You can't be too safe. 

It will be wasted money when you refinance, especially in this market.I have a loan closing right now in using this technique. 

And I suspect many managing Brokers are going to be heavy handed with the wholesalers and their techniques which we all know includes miss statements  white lies  and other subterfuge.

There is no "safe" investment in the stock market, real estate, etc., but you have to roll the dice and get in the game.

I really see Columbus Ohio as an extremely safe bet for the next 10-20 years.

You can't really ever know when that is going to happen, but I would say it's safe to anticipate at least 3-5% appreciation a year over time. 

Aside from the umbrella coverage, you can do everything in your power to make the property safe.

That they are teaching the same technique.

As i said, he isn't wrong, "IF" there was an option to just save up a few hundred thousand and buy that property cash with zero mortgage, yes it is "safe" in the manner that you can screw up and be horrible at finding tenants, managing the property and just overall life as a real estate investor, because there isn't a mortgage payment forcing you to feel the pain of failure monthly.