From my understanding, the fact of having tumor recurrence, even though low-grade, could reasonably warrant starting on the BCG. I had a similar concern about the need for BCG, in that I had recurrence of only low-grade tumors, and that was after two years (not the short 6 months). However, my urologist recommended it, so I started BCG back in 2008, and am now on 6-month maintenance dosing.
And, based on my limited knowledge, the "PUNLMP" designation for tumors is not so common any more. If I had to guess, I'd suspect that the initial tumor and recurrence were both the same type, i.e. TA, grade 1 (at least as it sounds from the reports you've typed in).
Ann