When going through AN114: Board Design Guidelines for Intel Programmable Device Packages, you may found incorrect unit conversion on page 35 and 36.
In table 14, "Recommended Stratix 10 Stencil Design for the UF50 Package" you may found following description:
22 mils (0.022 mm) diameter round aperture for 9 pads in each corner
18 mils (0.018 mm) diamater round aperture for 21 x 21 grid in center of array
Where the conversion from "mils" to "mm" was incorrect.
Also you may found similar problem in table 15, "Recommended Stratix 10 Stencil Design for the HF55 Package".
The correct date should be:
0.5588mm for 22mils
0.4572mm for 18mils
This problem is scheduled to be fixed in a future release of documentation.