I decided to go a different direction, but I just confirmed, it’s gone on webcore for me
so two things as a side note, 1 - I randomly ran into this amazing smart app for my purposes: Smart Zone motion detector (Zone Motion Manager) 2.1.0 release
really just for aggregating motion to turn down overall notifications - the other thing I went back to - is in the arlo app itself you can have a camera’s motion trigger recording on a different camera as well as itself - this, combining with disabling all notifications direct from arlo itself is what I’m doing now (email to dummy email address)