A breakthrough in tunnel cost and speed per meter. Have you read into this at all or is this just another snarky comment?

Almost every bored tunnel project has unique constraints. Lots of breakthroughs could be achieved by ignoring regulations and external considerations. This is not innovation or a particularly interesting result.

This 'breakthrough' appears to have mainly been achieved by ignoring health and safety regulations. Not so impressive.

I've seen Musk and TBC make those claims, I haven't seen evidence from the industry that they're actually having an impact.

Ignoring environmental regulations to externalize costs, apparently.