For console, F-Tohno can combo off of 214a air or ground CH, C/H can combo off of air CH only. However, it's not really easy for you to get air CHs with it.
Slide wins against jumpins that aren't deep because of the low hitbox. Maybe you can CH VSion IAD 6a but it usually hits people in the recovery of whatever move they did, aka no CH. When they're on the ground it's pretty risky to just throw out 214a because a lot of characters can cover ground movement quickly thus if they dashed at you and you threw out 214a you could be eating full bnb. You would have to throw out 214a waaaaaaay in advance to be safe and even if it got a CH you would have to be spaced a little bit past Tohno max 2c range to be able to combo off of it.
A more common way to combo off slide is if you predict a high shield at the end of a blockstring(to stop 22a) and you do 214b instead you can combo off of it pretty easily.
214a to poke out like Shiki did in the vid you linked to will likely be a smart way to poke out in blockstrings in CC. You'll slide under them if they did IAD and potentially hit them if they stay on the ground into nice damage.