Poeltl had a huge game, bruh, that's what you're missing. The fact that it doesn't meet your personal criteria for "great" due to missing blocks in the statline doesn't change the fact that it was, for everyone else who watched the game, a great performance from him.
I think you're really conflating Blocks = Defense here, tbh. You can perfectly defend the rim, deter shots in the paint, and otherwise alter the flow of the offense near the rim, without recording a single block (did Timmy record a block every single game? No...); and likewise, you can record many blocks, yet be uneffective as a rim protector or defensive anchor (matter-of-factly, Eubanks had 2 blocks, yet didn't protect the rim nor defend the paint and perimeter nearly as well as Jakob - would you say he had the better defensive performance?). Yes, many Bulls players scored on Poeltl - as I told you, and RC_Drunkford also pointed out, he was busy defending the perimeter players of the Bulls, mainly Lauri and switching on Lavine occasionally, which directly hinders his ability to be present at the rim in time to contest and block shots. Much harder to block shots when you're actively having to run after the opposing player from the 3pt line, tbh, and Poeltl had to do that many times last night.
Ideally, you want to have an also strong, defensive and shooting PF alongside Jakob, who can switch rim-protection duties with him when either is defending the perimeter, someone like Luka for example (it's no wonder the Spurs defense was markedly better with him alongside Jakob, and a mystery why he's not playing now). Right now, our first option at PF is either DeMar, who doesn't nearly have the body or defensive chops to fulfill this role, or Keldon, who isn't yet a good off-ball defender, much less a rim deterrent. So Jakob is mostly alone in that job (and if you watched the game, you had to notice Jak trying to play 1-on-5 on the defensive end that 1st quarter, he was getting no help whatsoever).
So, that's a long winded way to say your criteria for whether Poeltl plays good or doesn't, is not good. He had a great game, and we'd be incredibly lucky (and dominant) if we could get that Jakob every night. The reality is that yesterday's performance was closer to Jak's ceiling than to his mean... For better and worse