I am also noticing this! I’ve been Huel-ing for two meals a day as well for about a month but I’ve had some breaks when going away for a few days, and the difference is very… apparent! I used to be ~1 a day, sometimes 1 every two days, even when eating a high-fibre vegetarian diet.
Now it’s at least 3 per day. One day it was 6. They’re all also ‘nice, happy poo’ and I feel great!