Is this glitch now removed or is there just a funky way of doing it? Can't seem to find any guidance about it. Thank you!

Really late on this, but just wanna confirm that it does still work. Something to note is that you need to jump far enough away from the wall before Sonic will start running on it again. You also can't use the trick everywhere. I believe for 3D you can only do it while running along a wall, not running vertically up it, but in 2D it should always be possible.