No, it's not a typo. Apple has just released the third beta of iOS 13.5 as a continuation of the work done on iOS 13.4.5 betas. The reason for this change is found in the COVID-19 exposure Notifications API, a project that Google and Apple jointly developed.
IOS 13.5 has an API change that requires a new SDK
IOS 13.5 and Expression Notifications use the API required to build applications to fight coronavirus. Xcode 11.5 has a newer version of the iOS SDK it is necessary to be able to work with that API
Apple looks to be speeding up the work on this project, possibly to make the tools available to the developer more quickly. IOS 13.5 release and its similarity to iPadOS scheduled for mid-May
This method is not compulsory and each user must give explicit consent to participate in it. Both companies share information about privacy and security program, among which are prominent:
Each user MUST select REALLY to create the program, activating within the program their explicit permission to do so. And you can withdraw from it, at any time. No Apple or Google or anyone else may use this without the explicit consent of the user.
The system does not collect position data from the phone, nor does it share it with other devices, or with companies. The user always controls the information he wants to share, and when he wants to do so.
IOS 13.4.5 and now includes iOS 13.5, moreover, some improvements to the app. Among the advancements, we find that we may have shared Apple Music songs on Instagram. And they removed a few bugs related to Mail.