No True Scotsman puts sugar on his porridge, and No True Developer just installs WordPress.
On the other hand, even Rails and Django encourage you to use the ORM whenever possible, so even a "developer" who builds apps on a modern framework is unlikely to be familiar with advanced SQL features.
For me, if you had to write even a single line of a Turing complete language to a file (so shell scripts yes, but one-time shell commands no) to install WP, that would count as development. Otherwise, it's just installation. Note: I have never installed WP.
Do people really consider ./configure && make && make install and its equivalents to be development now?
IMHO the term "developer" should not be applied to those that can just ship but rather those who can also build.
It doesn't matter if they are web, desktop, nor low-systems developer actually
Most auto-called web developers are just "web masters"