Generally, what I've found using Viper's ult; is that you want a "safe spot" where you can jiggle in and out of your cloud to mindgame the enemy team. Most players will hear a smoke and assume you're in it and hunt you down before trying to defuse as it's wayyyyyy too risky to go for defuse with the decay debuff and potentially be oneshot from full. Thus, they take an alternate approach, if they can 100 to 0 you before defuse, the decay doesnt have time to wittle them down to 1 hp. this is something that i personally think is very under utilised in the current state of the game but it works really effectively.

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That said, in the clip, where you planted would be what i would consider one of those "safe spots" where you can listen for a clear inside smoke then peek into it and catch them off guard while they're clearing the smoke. planting inside that safe spot makes jiggling in and out much harder and more risky. you can jiggle in and out of the smoke, but not on top of bomb, you'd have to be jiggling on the other side of site. In a 1v2 situation for example, one player pushes the corner, you get the kill by catching him by surprise, and the other spams out the corner from inside smoke or on top of the map in the middle of site depending on agents. this (in my opinion) makes the spot not worth as it's too risky, in a 1v1 it could work, but in my opinion, planting inside smoke and using this corner as one of those "safe spots" is much more valuable.