I disagree. I think the numerals show that he is Western raised, from at least high school level. I agree that the 1 is funky (we just use a straight line in this country), but the European 1 does not have the "base," which he strangely included. In European handwriting, there is just the 7-appearing straight line with "roof" slanting down on the left side.
His 7 is VERY American. From anywhere else, it would have a perpendicular cross-line through it midway.
His 9 is also very American; in Europe it would curve to the left at bottom but here in the States it is straight on the bottom.
The Arabic way of writing the "Arabic numerals" is quite different from that used in the West (the 7 looks kind of like a V, the 5 like an O, the 4 kind of like a backwards 3, etc.)...the writer may have had to learn a new way of writing numerals after he came to the U.S.