Formula error in "Random wallpaper daily from"

First time I tried and it didn't work, I dropped it. But today I decided to see what's wrong with it and why it gives an error (my guess was that the reddit page source code was updated), turns out it was a typo in the formula given in knowledge base:

$tv(reg, wg(""+df(D), url, "", 0), "&.*", "")$

needs to be..

$tc(reg, wg(""+df(D), url, "", 0), "&.*", "")$

The photo has terrible resolution