The whole raw text dumps are pretty interesting.
"Rain
Damage dealt by Fire-type moves is reduced."
It seems rain was simplified along with sun, now just reducing Fire damage and probably being just environmental.
All the move descriptions are under wazainfo for anyone interested in checking out changes. It seems like they just took SWSH's move descriptions but didn't bother telling people that "you can't use this move" for newly unusable moves this time.
Status may be temporary as well based on anecdotes and the usage of the TurnMin/TurnMax columns that were usually used for confusion, sleep, and other temporary effects. Speaking of which I think confusion probably isn't a thing in this game, or rather everything that inflicts it was removed or changed like Water Pulse.