The nitrile ring of the ADBV covers to sets of holes in the baseplate.
The thinner outer part of the ADBV ring covers the inlet oil holes and keeps the oil from draining back out of the filter--the ADBV part. The inner area of the ring covers another set of holes in the baseplate. These holes lead directly to the filter center tube area. If the oil pressure across the filtering media becomes too great, the whole ADBV ring gets pushed out of the way enough to uncover the inner holes, allowing oil to go from the inlet holes to the filter center tube area, and out of the filter without passing through the filtering media.
Of course, their filters intended for engines with internal bypass valves do not have these features, but it's hard to see it anyway because the proper baseplate with the holes is covered with a piece of sheetmetal with only one set of holes. That is to make the top of the filter smoother and easier to install.