The terms "rolling release" and "automatic upgrade" are two different things.
According to Distrowatch, Deepin is not a rolling release any more (but it was until 2016).
For automatic upgrades, there's
probably an explanation on the
Deepin Wiki, but I don't know Chinese so can't confirm.
(If there isn't, the
Debian wiki has a page and probably works the same for Deepin.)