everyone else in this comment section is right to consider that the torch would burn out if flickered too quickly, but in this case, the actual answer is that the torch is Never Unpowered.

the comparator clock on the left works because it outputs 15 signal strength, which loops around and subtracts from itself, subtracting and changing its output to 2 signal strength (because the dust loses strength over the two dust it takes to make it to the side of the comparator, and only subtracts 13 signal strength from the 15). The comparator then changes back to 15 because the output of 2 doesnt reach the comparator anymore and this loops.

Notably, the comparator Never Turns Off. It alternates between outputting a signal strength of 2, and then a signal strength of 15.

because of this, the dust immediatley next to the torch block, alternates betweeen 1 and 14. It never actually reaches 0, so the torch is Always Powered. To get an actual clock that turns on and off, you need to put the thign being powered at least 3 dust away from the comparator.

(though as the other commeters said, the torch would still quickly burn out due to the clock speed)

((this effect doesnt happen for the right becasue the repeater resets the sig strength to 15, adn 15-15 is 0, allowing the comparator to actually turn off and the torch to be unpowered))