Thanks, but it was a projection for production later in the year - the SR+ was only a few weeks from entering production at that time, so the design was ready and planned future production rates would have accounted for it. I think (can't be absolutely certain, going on memory) that they even stuck to the 7k/week end of year comment later - maybe during the Model Y or 3 SR unveil, but I think during the Q1 earnings call.
However, it may well be the case that SR+ is a higher percentage of demand than they had anticipated (is that what you were referring to?) and that could be the reason that 7k/week is possible earlier. Unfortunately, that may be a bad indicator for ASPs in future. At least margins will be better.
I suppose another possibility is that they are simply prioritising SR+ production over other models for this quarter in order to make the 7k/week number. Hopefully they won't need to slow down production again next quarter for other models if Panasonic's extra capacity is available by then.