Yep he says that and I believe him. But the hole was apparently shorter then -- CBM wrote it was only 240 yards. If so then, unless the green has moved, the longest carry was much closer to 140 than 170.
For what it is worth, Tom Doak wrote the carry was 120-150 yards. Here again is his description of the original and of the 13th hole at OM:
On that hole, there is a big dune to the left and short of the green, and the green falls away hard from front left to back right, so you are rewarded by driving down the right side. On the original hole, there is a burn crossing diagonally from left to right to make getting the right angle harder -- it's only 125-150 yards off the tee, but remember, Macdonald became familiar with the hole in the 1870's, when that was a real carry. You only actually wind up with a blind second shot [not seeing the flag] if you yank your tee shot out of the fairway left.
We've got the tilted green and the big hill [which was already a part of the site], and we needed to build a short par-4 in that position. Instead of building a burn to nowhere, I put that little bunker in the right-center of the fairway to guard the preferred angle -- although not many people figure out that it is usually the preferred angle. Anyway, that's close enough to a Leven for me. After all, how many other guys can even claim to have seen the original!
I am not sure why Tom is assuming the 1870's, as CBM had been over visiting the holes in 1906, which was the year the description was published. Other than this point, I think I am saying about the same thing as did Tom, as well as CBM and HJW.