Everything aside of macOS could do the same thing through DisplayPort. 2x 4k displays seems totally within spec to me if the display technology being used is thunderbolt. If the resolution is low enough I could see a single port supporting 4 or more displays. The number of thunderbolt controllers really comes in to play with the 5k+ displays as apple is sharing both thunderbolt ports display bandwidth on a single controller to drive the display. The MBP16 has 2x thunderbolt controllers. In the case of the MBP13 2x thunderbolt model has 1 thunderbolt controller. Depending on the program you are using, you may have to trick the M1 Mac mini into recognizing that there are three monitors connected. I find that it often takes 30 - 60 seconds before the 3rd one lights up. The M1 Mac mini may not turn on all three monitors immediately.
Typically if you are using the Thunderbolt Display, each thunderbolt controller supports so many displays. I also had to download and activate the DisplayLink driver from. Thunderbolt 3 requires 1x 4k display per port, but that is the minimum not maximum. Apple just missed the memo while on the ThunderBolt band wagon like 10 years ago. Its more to do with the technology being used to deliver the display signal then the cable being used. If I am not mistaken even Apples HDMI adapter actually uses DisplayPort, DisplayPort is really the de facto display standard not thunderbolt. Things like Apples Pro Display, LG's ultrafine displays, Belkin docks to name a few use thunderbolt to carry the display signal and not DisplayPort.
Some Monitors and Docks truly use thunderbolt for their display signal. DisplayPort uses MST for multiple Displays on one port (daisy chaining or dock). Most monitors and docks use DisplayPort to handle their video feed, even if they are thunderbolt monitors or docks.
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