is there anywhere on the far left side of tanooki city (past where the cones would be if you didnt complete the hot springs quest line) Is there anywhere past there where you could get out of bounds?

nope, nothing in special to get out of bounds in the tanooki city area p sure the only OoB in this game is the bridge one of bambu forest far right, with the multiple games abuse

Killed, he might mean cone skip. For learning how to do cone skip, check the #guides channel in the discord server.

For simple explanation, do TSA with the skate 2 ushi. Go into the Tama building (railway station building). While exiting, press backspace. The pause menu will open up. Click to finish the rest of the dialogues. Go to the cones on the left side. While holding left, click on quit. You will be on the other side. To do TSA, while you are in range of the skate 2 ushi, to initiate and store dialogue, click space and the compass at the same time.

oh cone skip, isnt realy an OoB but yea indeed, this one isnt allowed unless you are in glitches+. but you can also just go to the bottom corner with cones in the top cones line and refresh the page, if you are close enough you will spawn in a building inside the cones-OoB