Water cooled chillers aren't advertised as outdoor because they make little sense to be placed outdoor as you're already aware. Ask if the enclosure and sensors are rated for outdoor - pick your favorite rating; NEMA 4, IP5x/IP6x or whatever is most common for units available to you, and ask if you can have the unit upgraded to that spec if it doesn't already meet it.
If their components and enclosures are outdoor rated you now have a water cooled chiller with an outdoor rating, even if they don't advertise it as an outdoor unit.
The few times I've done an outdoor water cooled it was when plans changed mid-project and the space for the chiller inside was no longer available. I think we changed a couple sensors that had rated versions, mounted a few things in j-boxes when they couldn't be outdoor, and added a window kit to the main control panel to cover the non-rated controllers.
But back to the original intent - air is cheaper and plentiful outside, and designing for site conditions is a one-time charge, instead of the ongoing expense of something like a cooling tower to provide that condenser with cooling water. The chemicals listed would pose an issue, but there may be a coating available to resist corrosion from those items on an air cooled condenser. You can always run the unit more remote and account for added run length by changing pipe size and/or pump head.