+ 1. My understanding is that the more permissive statement in 310.10(F) is the more widely accepted interpretation.
Some of this internal confusion in the NEC relates to the fact that a fair amount of the content that supposedly applies generically to "systems over 600 volts" really applies specifically to medium-voltage systems, which are systems that operate over 2,001 volts and have very unique requirements for conductors, terminations and wiring methods. The conductors and wiring methods used for 1,000 volt PV systems are more closely related to those used in 600 volt PV systems than they are to those used in MV systems. There is an awkward gap in the Code between 601 volts and 2,000 volts. Note that Table 310.15(B)(16) and 310.104(A) & (B) and similar apply to conductors rated up to 2,000 volts, whereas there are different tables for systems over 2,001 volts, like 310.60(C)(70), 310.104(C) and so forth.