It is suggested that  "Small" landlords use a collection agency, who will report the non-paying tenants to the credit bureaus.   

Some lenders report to the credit bureaus for DSCR loans and some don't.

well, you do of course and yes, even if your DSCR lender does not pay to report to the credit bureaus. the credit report is not, nor has it ever been the arbiter if you have a debt or not nor is it the only way the an underwriter will see that you have a debt.)

I doubt the bureaus will remove the inquiry without a police report for identity theft, and the lender who made the inquiry is likely to have an equally bad response.

Banks can share information relevant to a borrower's creditworthiness with credit bureaus but cannot disclose specific loan details to third parties without the borrower's consent.

The collection agencies report the debt to the credit bureaus.  

. - We still offer tenants the option of free ACH payments when they enable automatic Rent Reporting (to the credit bureaus).- TenantCloud does not process any payments (Stripe does) and is not holding funds or using them to generate interest.If you have any follow-up questions, please feel free to reach out to our support team.

Multiple that by the 3 credit bureaus, and that is 48 different potential scores.

We verify your information via the three major personal credit bureaus, as well as various utility providers.

It would be up to the lender to decide whether or not to count it, but the servicing company doesn't report to credit bureaus and most lenders will count it.