Is using decor considered as glitching for the purposes of a Speedrun?

On some games (mostly RPGs), speedrunners use decor elements to skip some zone(s) of the game (for instance in the Duke's Archive in Dark souls).

Since using decor doesn't look like a bug, is it still considered as 'utilising a glitch'? Would the Speedrun still be considered glitchless if you do these kind of moves?

Here is an example of such use of decor