Monster level and turn undead in Legacy of Bhaal mode BG2EE 2.3

Does anyone know if/how monster levels are altered in LoB mode? I read somewhere that monsters get 12 more levels but I couldn't find any Beamdog confirmation. I'm specifically wondering how that affects the cleric's turn undead ability. Because if this is true a cleric under level 20 probably can't turn anything...
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I agree that blowing undeads up left and right in that mode wouldn't make much sense, but rendering the ability completely useless (not able to at least fear) for 2/3 of SoA is maybe a bit too much...
Anyways, I do enjoy the mode sofar.
It's not completely useless, though. Later in the campaign it'll still be a good way to deal with nuisance undead, and it's still great for solo / duo runs. If you play through twice you'll have it on your second time through. (HoW mode and IWD in general was designed to be more conducive to multiple run-throughs.) But if they didn't dramatically raise enemy undead levels, it would completely break the game. Turning undead at a low level would result in a ridiculous amount of easy XP, which would give you a bunch of cheap levels, which would let you turn more undead, which would get your more XP, which would get you more levels, and on and on down the line.
(Note: again, I have no direct experience with LoB mode, all of this is conjecture based on my experience with HoW mode.)
https://forums.beamdog.com/discussion/54970/honest-discussion-about-legacy-of-bhaal
But from my experience in BG2EE 2.3 I can confirm that monsters have a lot more hp and attack more often and more accurately. Basically every single fight you need to buff up, have a tank with mage defenses and debuff the mobs. It's slow but not un-doable. The hardest fight I've had so far was the entry into the planar prison. I wanted Haer'Dalis asap so I went there immediately after chateau Irenicus. I haven't seen things like smarter casting mages yet like SCS does.