They say to do this in order to maximize the flower count. Hard winter rest period. I do not currently provide the temp drops in the winter and as a result am relegated to 1-2 random spikes of flowers, not the prolific show of flowers I should be aiming for. I have killed my share of neos keeping them too wet and cold. But maybe I’ll try to cool them down this go around.
To bloom them ..... They need winter cool dry rest of around 15C (that's night T at minimum, though they can go down to 5C without problems), watering when media is very very dry. In moss, just a light spraying every few days. And sunny too is important for winter. When roots start in spring (Feb-April), start regular watering and the spikes will come.