It is an interesting concept. Indirect collusion through a third party. Collusion may not have even been the original intent, but widespread success in the landlord marketplace has made it a fact.
Pretty sure it was the intent. When the software advises you the "suggested rent" based on other rents in the area and strongly advises you don't deviate up or down from the suggested rent that sounds like price fixing as a service.
The company also has pretty weasel word explanation on why it totally isn't price fixing which suggests they knew it would be an issue and took minimalist steps to create some sort of legal plausible deniability "We don't set the rent the employee/user manually does that ... based on the suggested rent based on other rents that we strongly suggest they don't deviate from". See we aren't fixing prices totally not us. Your honor there is a whole sperate person clicking a button.