The Terramaster page says:
If feasible, it would be good for people to know what the Terramaster's transfer rate is for a Mac that has Thunderbolt 3
but not USB4 support. (I can't remember which Macs fall in that category, but I know there are some.)
OWC clearly documents that on their page as:
Thunderbolt 3 port on Intel Mac or PC | USB (10Gb/s) | 990MB/s |