I wonder if I'm lucky enough to have stumbled on a new development during its inaugural broadcast. Sadly it's not strong on this recording (it was SIO 555 at the start during the number counting), but it sounds almost like DRM. This was the 0500 UTC / 10860 AM transmission. There was no repeat during the second half hour.
https://youtu.be/OASZ7_gAdEEEDIT: Yes, it's DRM - winDRM that is. Here's a video of my reception from the 0600z/10345 kHz broadcast of 21 FEB 2022, including the full run of number groups prior to the numbers/digital mode portion (skip ahead to about the 3:30 mark for that). This transmission DID include the repeat in the second half hour.
https://youtu.be/UshA1rC9pUkEDIT 2: I'd emailed Ary Boender about this and he informed me that the switch to winDRM occurred on 2/10. So I'm a bit behind the times.