RE: Beginner's guide: How to determine COLLECTION POWER

Yes, unfortunately it is lower. I think this has something to do with significantly higher supply, given that the new rewards have a 20x print limit compared to the previous ones.

This was their exact statement regarding this one:

The new Reward cards will have the same Collection Power and DEC burn rates as the new Chaos Legion set cards will have. These will be half of the Collection Power & DEC burn rate of the Untamed edition cards, and additionally the Collection Power & DEC burn rate of gold foil cards will be 25x the regular foil version of the cards rather than 50x as it has been in the past.