1. It depends where you store your data: if it a hosted feature layer on AGOL, no.
2. To use attribute rules, the feature needs a global id
3. This type of rule is applied to the point feature
4. MyParcels is the name of the feature class, and the variable 'parcel' refers to it
My suggestion is you take a look at the Arcade help pages to be come more familiar with it. Something you need to consider is that when you create attribute rules that take data from one feature to another, all the feature classes must reside in the same 'datastore' which is Arcade for database. At this point in time all my addressing data and the related features are in the same enterprise geodatabase. I notice that you refer to your parcel feature class as 'parcelview': is this an actual database view of the data? If so, that view and your address points need to be in the same datastore.
That should just about do it....