Yes and no. Cantonese has 9 tone categories that have 6 distinct tone contours. The 3 additional tones fall under the checked tone category (https://en.wikipedia.org/wiki/Checked_tone) for historical purposes, but their realized pronunciations coincide with the tone contours of 3 of the other 6 tones, so for most practical purposes, many sources describe Cantonese as having 6 tones.

I have an old Quora answer here that goes into more detail: https://qr.ae/pyNupi