There is also this section:
View attachment 344967
Which seems to say that for high-end radio reception equipment it should represent a minimal additional cost for manufacturer's to include digital radio - therefore no new devices should be allowed to be brought to the market without it. This might be why it only applies to more expensive AVR's?
Google translated version:
For device manufacturers, the legal requirement of Section 48 Paragraph 5 TKG is higher Equipping end devices with a digital receiving part involves a slight additional effort. With a view to the high and increasing sales figures of radio devices sold that are currently suitable for receiving digital content it can be assumed that there will only be a slight additional cost for the economy. Devices that do not have this functionality will no longer be able to be placed on the market in the future become. Since the radio devices can display the program name, but not one. The receiver, which enables the reception and playback of digital radio services, will no longer be allowed to be brought onto the market until December 21, 2020, so manufacturers have enough time to convert their production. The associated expenses are within the limits that manufacturers already have to make regular product adjustments. Until this point, the no longer “marketable” Devices are also sold.