Is today’s contest i.e. Inferno Numero is Rated??
no
No it is not a rated contest.
are only long challenge ,cook-off, lunchtime challenges are rated?
Mostly. But a few external contests are also rated, which is exclusively mentioned with them.
Yes they are rated, we also get some other external contests which are rated. for instance last external rated contest was byterace which somewhat looked like this
Byterace(Rated for division 2).