[anonymousiam]

https://en.wikipedia.org/wiki/M.2

[NewJazz]

The M.2 standard allows module widths of 12, 16, 22 and 30 mm

Notice no 20 mm width is allowed as part of the M.2 standard. The device specs are likely a typo.

[anticensor]

And then there is EDSFF's E1.S 30110 (30112 really).