The following screenshots are from
YOUR video, that you posted above,
you already replicated it
You clicked "Max level"
View attachment 36599
Then you placed a turret that had 450 health (You can see it had 4.5 bars, each bar means 100 health, therefore 450 health)
View attachment 36600
You even shot at it, you can see how much damage you deal to it, clearly being about 450.
I can't make it any clearer, if you still don't understand, ask somewhere else, I'm going to stop answering in this thread as this feels like trolling already.