I'm also seeing this issue. As mentioned, pagetypeinfo returns more info on page migration types, but less accurate totals than buddyinfo for large quantities. From the kernel code here, you can see pageinfotype truncates any count over 100k and just displays >100000.
The regex for this should be corrected for the pagetypeinfo stats to at least handle the > indication and instead of emulating the stats for buddyinfo, it should be called directly to get proper totals.