Arcam appear to have pulled out of MQA:

Originally Posted by Arcam (email received today)
Good afternoon,

We do not yet support MQA nor do we have any plans to I’m afraid.

Kind Regards.

Adam Osmond
Arcam
The West Wing
Stirling House
Waterbeach
Cambridge
CB25 9PB
England
They were certainly included in the early Meridian press releases alongside Onkyo.

Streaming: Roon, NUC, QNAP869 NAS
2ch system: dCS Vivaldi, Audionet Stern, Audionet Heisenberg, Magico Q1
Retro system: 101/104/105, Red Rose Spirit