The Mining Gadget can mine forged pillars, bypassing the need for a tier 5 Tetra hammer
Currently tested on 1.16.4 with Mining Gadgets 1.7.1, Tetra 3.4.0 and Forge 35.1.29

Please re-open if this is an issue still in 1.21

The mining level requirements were apparently lowered around 1.20.1, so it's a non-issue currently.