This is not an IceWhale Issue, the hardware works perfectly well with the thunderbolt kernel driver included in latest unraid 6 and 7 beta..
The issue is the upstream slackware used for unraid doesn't have any meaningful support for thunderbolt in userland (i.e. not like debian derived OSs do). it theory it might be possible to compile and add something like Arc's bolt.d to slackware/unraid - but this seems unproven and i would guess a very heavy lift if the unraid team were to do it. And unclear if this would manage all the needed TB4/USB4 aspects (TB4 == USB4). Also not sure how big a job this is as I believe the Linux drivers in the kernel are developed against a Debian derived userland. So i am certain once someone does this there will be new issues in the kernel that need to be fixed.
bolt daemon
I wouldn't see this coming to unraid anytime soon unless unraid chooses to add USB4 support as new USB4 disks and network adapaters come to market.