Not all games allow anonymous(read: without owning the game on Steam) mod downloads, but Noita does. So you can legitimately download Noita mods from the Steam Workshop using official tools. To make it easier,
I use this site. Given a workshop mod link, it will first walk you through downloading and using
the command line version of steam. It will also automatically generate the command to download that mod(right click to paste in cmd.)
The command is
workshop_download_item packageID modID - Noita's packageID is 881100, and the mod's ID is the number in its workshop URL, here's an example:
https://steamcommunity.com/sharedfiles/filedetails/?id=3010500498 So to download this with SteamCMD, first login anonymously with
login anonymous and then type
workshop_download_item 881100 3010500498 - if it says it failed, just send the command a second time and it should work, this happens if it has to redownload or update another item first(see last paragraph)
Either way, at this point you can find the mod in the steamCMD folder in the same folder tree it would be for the GUI version of steam- steamcmd\steamapps\workshop\content\packageID\modID
It will automatically "subscribe" and keep them up to date in this folder. This also means if you rename the mods to human names or move them to the game's folder, it will re-download them. If that annoys you like it did for me, simply delete \steamcmd\steamapps\workshop\appworkshop_881100.acf(again, 881100 is the packageID for Noita, if you use SteamCMD for mutliple games you will have multiple of these files with different IDs.)