Robert Clark has a long history of naievely talking about "liquid water" in the most improbable environments on Mars.

I agree that strong acid/brine aqueous liquids are POSSIBLE at some places and times on Mars, but we need better smarts to find them than expecting that a lander dropped into one of the colder and more boring bits of Mars will serendipitously find liquid water.

A strategy to FIND aqueous liquids on Mars needs to start from understanding the thermal structure of the planet, and the transport processes and chemistry of H2O on a cold arid planet. It needs to include the numerous unsuccessful tests for water on Mars, such as the lack of ANY radar reflectivity as would be expected from said salty acid brines down to several km in the crust, and the failure of liquid water models to explain the dry granular flows and gullies on Mars, as well as the mineralogical history of Mars which demonstrates a 3 billion year+ extreme planet-wide aridity.

There is PLENTY of ice on Mars, but genuine liquid water is a very elusive beast.

Let's work on understanding ALL the volatiles on Mars, not just the "sexy" one.