I would love to know whether it is possible to apply the BRRRRR method there or other creative financing over there as a foreigners.

If you plan on self-managing the properties, then you’ll likely need to register each LLC as foreign entity in state of CA and pay franchise tax for each one.

And he was getting foreign investors to wire him 100% of the purchase prices direct to him..

Buying real estate is NOT a foreign affair to anyone from any country.

I also noticed that tenants who are on DHS scheme usually have a higher turnover (e.g move in and out rather quick).As a foreigner, I have to rely everything on the property managers.

In my experience in foreign countries, there is often less consumer protections/ no central MLS or licensing/ greater risk to the principals, much more red tape, and overall higher transactions costs than here so it's important to look at the whole picture not just the commish %.

Other items such as having accounts in a foreign country.If you are single/married, with a few W-2's, interest/dividend accounts with one rental property.

Some of my favourite podcasts currently are The Andrew Hines Podcast, Gary Hibbert & RISE Network. 

So, if you create an LLC in another state, you will likely need to register it as a foreign LLC in California.

I am learning "lingo", for me it is like a foreign language.