Are there specific metrics or tools you rely on?

I wish there was a system for searching for STR specific things but I have only found something like AirDNA to be the closest even though it's far from ideal for that.

Most foreign buyers are high net worth individuals who want to park their money there in a safe haven and they don't need BP.No restrictions apply to American buyers in the countries they'd generally want to buy, including those mentioned by Federico and many other popular countries.When it comes to Spain specifically, some more conservative banks will ask you for a 40% downpayment (that would be the maximum) but that isn't the rule.

Oklahoma has a thriving network you can tap into.Partner with Local Agents: A knowledgeable Oklahoma-based agent can help you find properties in desirable locations.Look for Value-Add Opportunities: Cosmetic rehabs can boost equity and cash flow while keeping your initial costs low.If you want insights on a specific area in Oklahoma or tips on connecting with local wholesalers and investors, let me know!

Cleaner is paid a fixed rate for a specific job, you are paid a % of revenue.

Is it from experience of there are tools out there that show numbers on specific areas?

How specifically could they have done that?

From my experience, attending local meetups, lending-specific events, and networking with experienced investors can open doors.

You point out specifically "... on forum run by his publisher." 

Numbers are very specific to the market you are looking at.