How is fMP4 loudness information used in HLS

Question

2.18. Loudness management or Dynamic range control SHOULD be present unless all content (including ads) has been encoded at the same audio levels.

2.19. In fMP4 files, you SHOULD provide loudness information by way of a loudness box ('ludt'). When present, the loudness box takes precedence over any loudness information in the audio stream.

https://developer.apple.com/documentation/http_live_streaming/http_live_streaming_hls_authoring_specification_for_apple_devices

According to Apple's HLS Authoring Specification, it is recommended to add the loudness information defined in ISO/IEC 14496-12. I understand that this is required for xHE-AAC

But when working with AAC-LC or HE-AAC v1 or v2, since we are recommended to add a ludt box to fMP4 files, with loudness information, what effect does this have on the playback?

Assuming I have 2 audio files,

• Track1 at -14 LUFS
• Track2 at -8 LUFS

and both these tracks have ludt boxes encoded into fMP4 files, does the player on iOS devices normalize these track to a certain LUFS automatically? If the player does not normalize the tracks, then what effect does adding the loudness information have on the playback?