I am a landlord and not an attorney. For that reason, will answer this question from that perspective.
The Dodd Frank Act covers "collections" as primarily in a collections agency. If can cover a corporation collecting debts of course. It has nothing to do with a landlords ability to obtain a judgement or collect a debt which is covered by your states Tenant Landlord Act (or something similar).
The landlord has the right to file a complaint against anyone who has not paid rent, caused damage to the property, or any other loss to the landlord as a result of your action or inaction. Filing and getting a judgement is not collections as covered by the Dodd Frank Act. Once a judgement or judgements have been entered, there are several options including through the sheriffs department seizure and forfeiture depending upon your state law.
Only if the landlord sends your debt to a collections agency, does the Dodd Frank Act apply and, in that, only applies to how the collections agency that collects the debt and not to the landlord. It does not apply to the debt, the ability or right to collect the debt. It applies to the behavior of the collections agency seeking to collect the debt only.
For what it is worth, with so many legal options available to the landlord and not similarly afforded to consumer debt, it is unlikely that the landlord will use a collections agency. Options can include a collections attorney, the sheriffs department, direct collection by the landlord, the courts, etc. Landlords often take a loss of some sort using a collection agency and therefore avoid the option unless as a last resort. Often, if direct collection efforts fail, the landlord will either receive relief through the courts or through the sheriffs department according to state law, both of which are unavoidable and not ordinarily covered by the Dodd Frank Act. In this case, it is akin to owing the state the debt just like any other debt owed to the state. The state will have rights afforded by law such as the right to withhold privileges offered by the state such as drivers licenses, titles, tags, building permits, other licenses, etc. This may not apply equally in all states. You will have to read your states law to know what the limits of the ability of a landlord to obtain and collect a debt are.