Slect Data from column name specified in different column

Hi all!
So I have and issue.

So
In SelectFromTable I have a table that I wish to filter.
In ColumntoSelect I have column name that needs filtering.

Now, im using Power query in Excel.
also I followed the M code from this article here:
https://powerusers.microsoft.com/t5/Building-Power-Apps/Convert-text-string-to-column-name/td-p/1670513
by @elnachota.
However im finding an erroor that My Value Im filtering out does not exists:

which is weird:

and here is my full Mcode:

let
    Source = Table.ExpandRecordColumn( Table.AddColumn( Table.FromList( {"Case1", "Case2", "Case3"}),"Record", 
each 
[
ColumnToSelect = 
if [Column1] = "Case1" then "[Column1]"
else if [Column1] = "Case2" then "[Column2]"
else "[Column3]",
SelectFromTable =  Query1]),"Record", {"ColumnToSelect","SelectFromTable"}),
    Custom1 = Table.AddColumn(Source,"Selected Columns", each 
      let
        tabla_de_la_linea    = [#"SelectFromTable"], 
        columna_para_filtrar = [#"ColumnToSelect"]
      in
        Expression.Evaluate(
          "Table.SelectRows(tabla_a_evaluar,each " & columna_para_filtrar & " <> A)", 
          [
            Table.SelectRows     = Table.SelectRows, 
            tabla_a_evaluar      = tabla_de_la_linea, 
            columna_para_filtrar = columna_para_filtrar
          ]
        )
  )
in
    Custom1