I can certainly attest that this effect works significantly in landings as well. I did my initial training in a Diamond DA20, which is a very clean bit of kit and reluctant to slow down. It has a T tail. So I got into the habit of closing the throttle ‘over the fence’ to ensure we didn’t go too deep. Very little trim change was involved.
Come the day I went to get checked out in a PA28. All went well and the instructor was convinced I could fly, till on final I whacked the throttle closed! Felt like we had been shot down; and suddenly the windscreen was full of grass and runway. The actual touchdown was actually ok, but the instructor had been caught off guard and was not happy.
So yes, T tails give very different handling power in Vs power off.