S-TAB using a hack?

[DutchGuy]

Hi i would like to know if the S-TAB function is a hack or not?
on a server called Graal Legacy i was kicked off the server with the reason of using a illegal program.
When i came on again i was accused of using a auto clicker or something by Darknations_Staff (Mid chill)
as much as i convinced him that i was using the S-Tab function which has been around forever (it makes you swing fast...using S once then keep tab pressed). in graal legacy you need to slash barrels a 1000 times to get 250rupees.
So i was just smart enough to use the S-Tab function.
he then went crying bout me using a hack and that it wasnt possible to use the S-tab function. Till he saw it with his own eyes, and used it himself.

He then changed the whole subject to Glitch using (to not make him look stupid in others eyes, because there were 3 others in the room). He kept on trying to blame me on something, while i used a normal graal function.

So question: is it a glitch or a hack? or is it normal.