Filtering to reverse filtering. What??

The query below reads tables "Deals" and "SelectedName" (1 row with the selected name).

It filters the deals on the selected name.

The result is joined with all deals (nestedjoin).

A column is added with all individuals (<comma><space> separated).

The column with tables from the nested join is removed,

let
    Source = Excel.CurrentWorkbook(){[Name="Deals"]}[Content],
    Deals = Table.TransformColumnTypes(Source,{{"Deal", Int64.Type}, {"Individual", type text}, {"Amount", Int64.Type}}),
    Source2 = Excel.CurrentWorkbook(){[Name="SelectedName"]}[Content],
    SelectedName = List.Single(Source2[Name]),
    FilteredDeals = Table.SelectRows(Deals, each ([Individual] = SelectedName)),
    Merged = Table.NestedJoin(FilteredDeals,{"Deal"},Deals,{"Deal"},"NewColumn",JoinKind.LeftOuter),
    Individuals = Table.AddColumn(Merged, "Individuals", each Text.Combine([NewColumn][Individual],", ")),
    RemovedNewColumn = Table.RemoveColumns(Individuals,{"NewColumn"})
in
    RemovedNewColumn