Read also Cabasse’s support document:
If you have an android smartphone, please note that an iOs device is only required for the setup, after the installation is completed you will be able to use your roon tested device freely.
Reads like the use of an iOS device is mandatory and AirPlay (with all its restrictions) is used for streaming. I don’t know how it is helpful for Android users to know “that an iOs device is only required for the setup”.
Cabasse’s other statements seem a little bit problematic to me too:
With Roon Tested, the audio streams are ideally matching the capabilities of the certified devices, making them compatible with Roon Ready devices, with the device icon appearing in the Roon app menus.
With regard to the limitation of AirPlay (max. 44.1 kHz, 16 bit resolution) “the capabilities of the certified devices” seem to be not very high (“the audio streams are ideally matching the capabilities”).
“making them compatible with Roon Ready devices, with the device icon appearing in the Roon app menus” – Roon Ready devices are using RAAT for streaming, support for streaming HiRes material too and allow for grouping with other RAAT zones – nothing one can do with the AirPlay support of the Pearls (but grouping with other AirPlay devices is possible). What the presence or not of a device icon has to do with compatibility (to Roon Ready devices) is left to the wise people from Cabasse. Fun fact: There is just the generic speaker icon to be seen in the linked document anyway.