No, you are wrong. That is faster than the eye, not faster than light.
When someone shots a gun, do you see the bullet? No... you don't, because it's too fast for you, faster than the eye. Yet if you compare its speed to the speed of light, it would be sooooooooooooo slow, that it would look as if the bullet was stopped in time, and it wouldn't move at all.
Speed of light is 900000 times faster than the speed of sound. To compare, speed of light is faster than a supercar at 300 km/h if compared to a snail.
The Fairy Tail verse is slow as hell if compared to the Narutoverse, where only Madara had a speed of light laser, and Naruto dodged it. It was arguably asspull. Not even Goku moves at the speed of light (instantaneous transmission not taken into account).
So that you understand it, in this manga, magic rays are plasma. Magic attacks may be anywhere from supersonic (340 m/s) to lightning speed (600,000 m/s), nowhere near speed of light (300,000,000 m/s).
So, Glidartz could've executed 13 punches in 1000 m/s, which is quite fast, but if you compare it to the speed of light, it'd be sooooo slow that it'd look like Glidartz's arm is COMPLETELY still.
Let me put it that way, if a punch is the extension of the arm 1 meter, and Glidartz is 1000 m/s fast, then he can throw 1000 punches in one second. And he is massively slower than light.
Look at this video:
<- in it, Glidartz would be the Thrust SSC, he probably is nowhere near the Voyager 1. Look at the speed of light.
Light crosses the line in 1 second, yet Glidartz's speed takes 10 days to complete the same distance. If put together, for light it is like if the Thrust SSC is completely immobile, still. Do you understand the atrocity you just claimed when you said Glidartz is FTL? You sincerely should admit that you're wrong publicly.
You seriously need to educate yourself before making stupid claims.
http://www.outskirtsbattledomewiki.com/index.php/13-general-obd-terms/45-speed