Per Rivian, it's always on. 3' and under is their recommendation, they said over 3' there's a chance of the vehicle losing traction and/or floating.
Just because Rivian can do it, doesn't mean it's not impressive that the CT can as well.
You asked for links...then deleted it:
Depending on your suspension settings and wheel size, the maximum water fording height of the R1T is 43.1 inches and the height of the R1S is 43.0 inches while all the doors, front trunk, gear tunnel, spare tire compartment and lift/drop gates are fully closed. Do not open the vehicle while...
rivian.com
Electric vehicle startup Rivian has the tech to back up exciting claims.
www.cnet.com
The 3' comment was from a video much like the Monroe video. Their website says 43" depending on suspension, but the last article is talking about their battery and how it's completely sealed/waterproof.