Nice video.
I've been thinking about K922 with spades on JT9 4 hand for 20 minutes.
Probably even some good regs are underdefending (or don't have proper range)
in bet Flop, x/c Turn, x/c River line. So your line is exploitable and probably works against most opponents (given that you would also bluff river). However , against really good players, we will be overbluffing (since we are exploiting underdefending) with this hand.
Theorywise, I think we should check this hand on the turn and bluff with it on the river on this particular runout (reasons will be explained later).
It would be really bad if we get check/raised on the Turn with this hand, really bad. We fold out a lot of equity given the pot odds. And when we check, we can hit 2, spade, 9, Q and play some rivers or bluff this one for example.
Hands we would be bluffing Turn and River when checked to should be lower equity bluffs, containing Q and preferably not block spades (so its more likely villain was on a spade(combo)draw. We would have enough of this kind a floats on the flop, with backdoor hearts for example. Blocking a K is not so relevant since he doesn't have KQ, so we only block for him to have a blocker, while blocking Q also block some of his Q8 hands that prefer to play this way. And also, blocking spades is not helpful:)
As far as you played the hand, it is probably mandatory bluff on the river.
We can have a lot of lower straights, while villain will mostly check bottom OESD on the flop. I think we would like to bluff river less than pot size to include Jhigh straights.

Havn't do any PJ work or similiar, these are just intiutive thougts.

can you do hands where you're in really tough spots and maybe you find yourself in a spot where your range is capped and facing pressure.