This is something I really love about my job. It's a small company, and we don't have any of these kinds of process overheads.
It's accepted that people fuck up (and in most cases that're relevant to me, I'm the people in question) but if I can reproduce the problem, I can often get the fix in the users' hands the next day. Generally the positive effects of a quick turnaround and feeling like they matter outweigh the negatives of the problem being there in the first place.
Not to say I don't have stuff in the "tech debt" bucket, but having the autonomy to just fix the low-hanging fruit makes for a satisfying work environment.
It actually appears to be per bike per 100km. I find that quite surprising given it's half the number of tyres, there's substantially less initial volume per tyre than a car's and, as you say, there's a lot less weight on them.
Given their focus on MTBs, I wonder if it's related to the type of terrain being ridden (higher incidence of gravel/sharp rocks than your average road) or different tyre compounds between the two vehicle types.