The difference is that BPB was quite a perfect copy of the 2009 tournament, including that change on #7 and the shorter Champions' tee on #15 which is documented online from the USO.
Here, the deviations to the tournament settings and the general scorecard are evident.
Investigating deeper, I found some possible source for this.
A scorecard from 2011 shows a limited but significant difference to the 2014 scorecard (pdf):
Between #4 and #5, the Pars and HCP are interchanged + lengths adapted. WGT's setting are a mixture of these, resulting in #4 being a 569 yds Par4, HCP 15(!).
=> They may have been surprised by those changes and only done a minimum to follow.
Furtheron, the new scorecard shows three different Par settings between the tees, compare holes 4, 5 and 8, and WGT supports only one, AFAIK. Alas, this doesn't explain other length deviations from the shorter tees, notably on holes #10 and #14.
It's still a mess, and apparently good enough for "the best online golf game".