Display Not selected values from Slicer (Consider selections from other slicer)

// Assumption:
// You've put a table on the canvas that
// holds Customers (their names or IDs).
// The source for this table will be a
// disconnected table that will only hold
// all the names of the customers. 
// You can create such a calculated table with
// this command:

[Excluded Customers] = // table
	distinct(
		T[Customers]
	)

// Say the table's name is 'Excluded Customers'.
// You also have 2 slicers that come from
// the T table.
//     1. Customer Names
//     2. Years
// Here's a measure that can be used for
// the table 'Excluded Customers' above to show
// the customers which have not been selected in the
// slicer.

[Should Show?] =
var __custCount =
	DISTINCTCOUNT( T[Customer] )
var __totalCustCount =
	CALCULATE(
		DISTINCTCOUNT( T[Customer] ),
		ALL( Customer )
	)
var __shouldFilter =
	__custCount < __totalCustCount
var __oneCustVisibleInExcludedCustomers =
	HASONEFILTER( 'Excluded Customers'[Customer] )
var __oneYearSelected =
	HASONEFILTER( T[Year] )
var __shouldShow = true()
	&& __oneYearSelected
	&& __shouldFilter
	&& __oneCustVisibleInExcludedCustomers
var __result =
	if( __shouldShow,
		1 * NOT (
			SELECTEDVALUE( DC[Customer] )
			IN VALUES( T[Customer] )
		)
	)
return
	__result