Google cognitive dissonance and you'll understand the true agenda for their presentation. https://en.wikipedia.org/wiki/Cognitive_dissonance"The discomfort is triggered by the person's belief clashing with new information perceived, [or perceived new information, which is neither new nor informative] wherein the individual tries to find a way to resolve the contradiction to reduce their discomfort."

I justified selling my house to buy two as using the stacking technique.

Unfortunately, you're probably reading that MFH are dried up right now and it's true- you'd have to dig dig dig to find a motivated seller and use some more creative techniques to find the right property.

So both these guys have courses on techniques for profiting in land?

the first is a little too broad for my taste.Your technique of outsourcing isn’t nearly as common here.  

Any other low money down techniques you have figured out?

I know how frustrating it is to work so hard for something only to lose it, the knowledge or techniques to become out of date and to feel that you have lost your 'edge'.

For years, licensed investors have used the MLS to find deals in the marketplace through various techniques.3.

Are you familiar with this technique?

-A From my understanding of Machine Learning...Cognitively, it is lacking compared to the human mind.