To understand tabstops properly, you need to throw away the "They always expand to N spaces." idea. If you have access to a mechanical typewriter with tabstops, then go and look at how it works (with tabs being set by protruding pins on the carriage). Tabstops in terminals in the Unix and Linux worlds work this way.
> > If you had used tabs, changing the tab size would make it align all wrong.
> This is clearly false. You said this after giving a perfect example of how it's done with tabs.
I believe the post you're replying to meant "used more tabs". That is, if you used any tabs beyond the code indentation, they would get altered when you change the indentation size and ruin the alignment.
When I made my original comment I thought what I was replying to was an example of "tabs to indent and spaces to align" immediately followed by a statement that the only way to use tabs is to both indent and align.