I could not agree more. I have a lot of nicely framed landscape shots that are flawed because trees/bushes have moved during a long shutter period while my camera was mounted on my tripod and my ISO was set to 100.I humbly disagree.
Any serious landscape photographer will use a solid tripod and low low ISO.
Even on the tripod...
Moments happen - a billowing of clouds over the rockies; the moment dawn breaks; the leaves in an autumn wind; the capture of a fleeting light beam in a slot canyon.
The world does not stop to match a long time exposure just to accommodate ISO 100.
I believe the target is to keep the iso as low as possible, being on a tripod can do nothing but help.
Let common sense prevail rather than stick rigidly to some arbitary rule