All tetra modular tools can be enchanted by infuser.

tetra-1.16.5-3.20.0

EnchantingInfuser-v1.0.2-1.16.5-Forge

Is this not intentional? Can you enchant tetra tools in an anvil?

So not sure what the expected behavior is supposed to be for Tetra. After all the infuser uses the exact same code as the vanilla enchanting table for checking if an item can be enchanted. So closing this now, if you can describe in more detail what's going wrong and what's expected please reopen.