Slitherine

hi all

forgive the basic question but i saw this game on sale and taking a closer look at it. some great reviews as a hidden gem. i dont do steam but saw the comment on the description page and i just want to confirm at i dont need steam to play this game with the instant download.
thanks

"" you buy Pike & Shot: Campaigns from Slitherine or Matrix, you will be able to use the serial assigned to you to activate your product on Steam. In order to do this, hit the "add game" button located to the bottom left of the Steam client and follow the on screen instructions. When prompted for a Steam key, enter the serial assigned to you by Matrix or Slitherine. ""

If you buy the digital download ( or with cd combo) from Slitherine or matrix, no , you don't need steam, you just get a steam key in addition, if you ever need/want one.
Cheers!