For over-land flights, you don't think the sonic boom might have any impact on wildlife?

We’ve had supersonic flight for just over 70 years now, and haven’t seen any indication that your fears are justified.

.. and it's been banned over land for civilians and rarely used by militaries.

Apparently non oceanic flights are banned in the US, so it’s currently a non-issue here. Not aware of the EU restrictions.

One of the explicit goals of Boom the company is to make overland flight viable (which makes the economics of supersonic flight closer to viable).

How is a sonic boom 1/40th the volume of Concordes going to affect wildlife?

That's the question, isn't it? It would be a good idea to find out.

(Additionally, I suspect any figure like 1/40th the volume of Concorde is drawn from thin air at this point. They don't have a prototype flying subsonic yet, much less supersonic.)

Which land are they flying over?

They don't have an aircraft yet, obviously. But one of the company's explicit goals is overland flights.