If you really want to get to cash flow much sooner, start learning to do things yourself. 

Now if he gets you by the hand and shows you how to buy with no cash and credit, and you are able to buy, then his snake oil is worth it weights in gold, but he will have many excuses his business is selling snake oil not real estate.

Infinite cash flow with minimal work was the goal.

You will almost surely be at negative cash flow house hacking in JC, depending on how much down.

Is that cash, small bills, in a suitcase?

Obviously not every property is going to be a home run but a lot of deals I've analysed have struggled to be cash flow positive after crunching the numbers.

Purchase price: $330,000 Cash invested: $16,500 We purchased in 2021.

Now that you are behind the bank has to put this as a liability on their books and have $400k cash set asideBanks only require 10% reserves typically so that $400k is stopping them from lending approx 3.6M in loans 3.6M at 7% is a big number and will lose a lot more from this than $10-$20k on your loan.

If I have a ground up build I paid cash for, can I use a DSCR loan to take a mortgage out on that house to build a rental home on a lot we have next door?

If you can afford to hang on to it, do some value add and be okay with less than ideal cash flow for the first few years, you should still do fine, but most people want that instant cash flow.