Need help converting excel statement power query

You can pretty much directly translate this into Power Query code.  There are no brackets for if ... then ... else  but the rest is nearly the same.

Something like 

=Table.AddColumn(#"Previous Step", each 
(if [Customer Survey Status] ="Completed" or [Customer Survey Status]="In Review" 
    then "1," else "0,") & 
(if [Partner Survey Status]="Completed" or [Partner Survey Status]="In Review" 
    then "1," else "0,") & 
(if [Document Status]="Completed" or [Document Status]="In Review" 
    then "1," else "0,") &
(if [Invoice Status]="Completed" or [Invoice Status]="In Review" 
    then "1" else "0")
)

Or if you want to use List.Contains: 

=Table.AddColumn(#"Previous Step", each
let l = {"Completed","In Review"}
in  
(if List.Contains(l,[Customer Survey Status] then "1," else "0,") & 
(if List.Contains(l,[Partner Survey Status] then "1," else "0,") & 
(if List.Contains(l,[Document Status] then "1," else "0,") &
(if List.Contains(l,[Invoice Status] then "1" else "0")
)​