It's not an argument: it's why I don't use Python. No argument here, and nothing anyone says will convince me that the Python way is the right way at all.
And yes, I can easily argue for non-indented code for certain circumstances (print-debugging outdented so that it's more obvious to the eye when you're cleaning up the binary search prints that are surrounding your bug). Python doesn't allow those circumstances; it also doesn't easily allow for nicely embedded Python in templates.
There are definitely cases where indentation as syntax is the wrong choice, and my use cases tend to hit those. Thus, I don't use Python. If someone else find this misfeature to be a security blanket? More power to them. But not me.
You indent your code anyways, in any language. Hence there is no extra work involved for writing Python.
And yes, in this case that is the preferable way to do it. Unless you want to argue for non-indented or randomly indented code.