Drang seems to think that Musk wants dampers (inside pillars) to handle large thermal expansion:

> Eventually, the dampers in the pillars won’t be able to handle the movement because it’ll be greater than the pillar width. Eventually, the movement will be greater even than the distance between the pillars.

But the tube is "not rigidly fixed" to pylons. It slips past pylons during expansion or contraction:

> By building a system on pylons, where the tube is not rigidly fixed at any point, you can dramatically mitigate Earthquake risk and avoid the need for expansion joints.

In fact, the author quotes the above in the beginning of his article, but then assumes exactly the opposite.