Lug rating

[jumper]

But with a specific marking like that, I would say it cannot be used with other strandings. In my opinion that marking limits the use of that lug to finely stranded conductors that have 2090 or less strands of 30 AWG.

I will not argue your logic, but I will say that if I got a conductor with 21XX strands because of a small manufacturing error on the size of the #30 that results in more strands but the final diameter of the overall conductor is correct, ie 4/0, it gets terminated.