Imprisonment and Tactical Decision should beat Lockdown yes. I don't really understand how you can argue NG decks with way more provisions will somehow lose to Lockdown unless you're looking purely at winrates which wouldn't make sense in this context.I won't even argue that point because I'm you've been playing the game long enough to know that's not even remotely true.
You can select the leaders doing well currently to prove your point which is shortsighted given there are several leaders to consider. Let's use one from your very same faction....imprisonment, tactical decision. Both of which relies on the leader ability for a necessary point swing and has added specific units that rely on that. What then? Is that even? More often than not Lockdown is accompanied by Ball (not saying the op does) but I've rarely encountered one without the other. Against those leaders or even Shield wall you're almost assured a win with the added cheap removals at NG's disposal. Do SW players deserve it, yes..... Is that healthy for the game No.
You're definitely never assured a win playing Lockdown either. As I said the decks Lockdown counters the most all have ways to adapt if you don't instantly forfeit. Unless you're doing OH decks without consume units or Ursine without self-damage, which would be completely ridiculous.
Running a 15 provision Ball in Lockdown a leader with barely any provisions will most often result in a autoloss once it's Heatwaved, even if it sticks it will most likely lose due to the rest of the deck falling behind.
The only reason Lockdown was ever viable was double ball, now it's back to being a joke again which I'm perfectly fine with.