This is always a fun question!
From a strictly purist water fasting perspective, the answer would be yes, as ANY caloric intake would break a fast.
We always look at this question though from a “what are you optimizing for?” perspective.
The state of ketosis has been shown to act bio-chemically as a fasting mimetic (reduced inflammation, increased autophagy, suppression of mTOR & up-regulation of AMPK).
Personally, we're optimizing for longevity & hyper-functionality with ketosis, IMF & exercise.
Our creamer, due to the heavy C8 MCT base, increases ketone production and is right around 100 calories per dose. We use it every morning and do not consider it a fast breaker.
I suppose that makes our fasting modality more like a “fasting mimicking” or “modified fasting” approach.
We get all of the bio-chemical benefits of fasting & ketosis without doing a pure dry or water fast.
So! The answer to that is really going to depend upon what “fasting ideology” you are choosing to follow.
Here’s a great blog post from Dom D’Agostino on a 72hr modified fast he did using Keto Brainz.