Add trim after Split

You can replace 

Text.Split([Text], "|")

with

List.Transform(Text.Split([Text], "|"), Text.Trim)

to trim each string after separating by "|".

Here's another implementation that uses List.ReplaceMatchingItems:

let
  Repl = Table.Buffer(ReplacementsTable), 
  Text = Text, 
  Result = Table.AddColumn(
    Text, 
    "Changed Text Expected", 
    each Text.Combine(
      List.ReplaceMatchingItems(
        List.Transform(Text.Split([Text], "|"), Text.Trim), 
        List.Zip({Repl[Word To Replace], Repl[Replace With]})
      ), 
      "|"
    )
  )
in
  Result