Groupby Criteria, Power Query Excel

HiAnonymous 

Place the following M code in a blank query to see the steps.

let
    Source = Table.FromRows(Json.Document(Binary.Decompress(Binary.FromText("dY7NDoMgEIRfZcPZixTEHjeKFeXHsDQ2Mb7/axQPbVqMt8nMt7OzbUzImtc3VjGERUcK/pBEhhL6xPbqh5iAnEljVg49PnQs4qABo7u+H6LuYbAm+5cMoYMYuvlEKCWlENle8GlhxaGY8c3JuODh+HXqaJqaC5nt2ThIoe/LjlbdVZvNbsRojYbV2C68rqloKPe4AuBcCCk/U6fgNf1P2d8=", BinaryEncoding.Base64), Compression.Deflate)), let _t = ((type nullable text) meta [Serialized.Text = true]) in type table [ID_NO = _t, NAME = _t, ROLE = _t]),
    #"Changed Type" = Table.TransformColumnTypes(Source,{{"ID_NO", Int64.Type}, {"NAME", type text}, {"ROLE", type text}}),
    #"Grouped Rows" = Table.Group(#"Changed Type", {"ID_NO", "ROLE"}, {{"Aux", each Text.Combine([NAME],",")}}),
    #"Pivoted Column" = Table.Pivot(#"Grouped Rows", List.Distinct(#"Grouped Rows"[ROLE]), "ROLE", "Aux"),
    #"Reordered Columns" = Table.ReorderColumns(#"Pivoted Column",{"ID_NO", "MANAGER", "ASSISTANT"})
in
    #"Reordered Columns"

let
    Source = Table.FromRows(Json.Document(Binary.Decompress(Binary.FromText("dY7NDoMgEIRfZcPZixTEHjeKFeXHsDQ2Mb7/axQPbVqMt8nMt7OzbUzImtc3VjGERUcK/pBEhhL6xPbqh5iAnEljVg49PnQs4qABo7u+H6LuYbAm+5cMoYMYuvlEKCWlENle8GlhxaGY8c3JuODh+HXqaJqaC5nt2ThIoe/LjlbdVZvNbsRojYbV2C68rqloKPe4AuBcCCk/U6fgNf1P2d8=", BinaryEncoding.Base64), Compression.Deflate)), 
    let _t = ((type nullable text) meta [Serialized.Text = true]) in type table [ID_NO = _t, NAME = _t, ROLE = _t]),
    RR = Table.Group(Source, {"ID_NO"}, {{"all", each Table.PromoteHeaders(Table.Transpose(_[[ROLE],[NAME]]))}}),
    #"Tabella all espansa" = Table.ExpandTableColumn(RR, "all", {"MANAGER", "MANAGER_1", "ASSISTANT", "ASSISTANT_1", "ASSISTANT_2", "ASSISTANT_3"})
in
    #"Tabella all espansa"

It seems to me that this problem has the same structure as the one discussed here